Yevamot 46

גוי גופא לא קני ליה מאי דקני ליה הוא דמקני ליה לישראל וכיון דקדם וטבל לשם בן חורין אפקעיה לשעבודיה

His previous gentile owner did not have ownership of the slave’s body, since a gentile is unable to have ownership of another’s body; rather, he had rights to only the slave’s labor. And only that which he owned in him was he able to sell to the Jew. Therefore, before immersion, the Jew had rights to only the slave’s labor, but not ownership of his body, and therefore, once the slave preempted his owner and immersed for the sake of conversion to make him a freeman, he abrogates his master’s lien upon him.

כדרבא דאמר רבא הקדש חמץ ושחרור מפקיעין מידי שעבוד

The Gemara notes: This explanation is in accordance with the opinion of Rava, as Rava said: Consecration of an item to the Temple, the prohibition of leavened bread taking effect upon a leavened food, and the emancipation of a slave abrogate any lien that exists upon them.

מתיב רב חסדא מעשה בבלוריא הגיורת שקדמו עבדיה וטבלו לפניה ובא מעשה לפני חכמים ואמרו קנו עצמן בני חורין לפניה אין לאחריה לא

Rav Ḥisda raised an objection from a baraita: There was an incident involving Beloreya the female convert in which her slaves preempted her and immersed before her own immersion for her own conversion. And the details of the incident came before the Sages, and they said: The slaves acquired themselves and became freemen. Rav Ḥisda explains how the baraita poses a challenge: The baraita implies that only because the slaves immersed before her, while she was still a gentile, that yes, they became freemen; however, had they immersed after her, i.e., after she had already converted, then no, they would not have become freemen. The reason for this is presumably that upon her conversion she attains the rights to her slaves’ bodies, and therefore their immersion for the sake of becoming freemen would be ineffective. However, this contradicts the Gemara’s explanation above that when a Jew gains ownership of a slave from a gentile, he has a right to only the slave’s labor.

אמר רבא לפניה בין בסתם בין במפורש לאחריה במפורש אין בסתם לא

To resolve the challenge Rava said: When the baraita says that because they immersed before her they acquired themselves, that is whether they immersed without a specified intention or whether they immersed with explicit intention to convert and become freemen. However, had they immersed after her, if they did so with explicit intention to convert, then yes, the immersion would achieve that end, but if they did so without a specified intention, then no, their immersion would, by default, be considered for the sake of slavery and they would not become free.

אמר רב אויא לא שנו אלא בלוקח מן הגוי אבל גוי גופיה קני

Rav Avya said: They taught that one acquires only the rights to the slave’s labor only with regard to a Jew who purchased a slave from a gentile slave owner, but if a gentile sold his own body as a slave directly to a Jew, then the Jew acquires his body.

דכתיב וגם מבני התושבים הגרים עמכם מהם תקנו אתם קונים מהם ולא הם קונים מכם ולא הם קונים זה מזה

As it is written: “Moreover, of the children of the strangers that sojourn among you, of them you may acquire” (Leviticus 25:45). The verse states only that you, i.e., Jews, can acquire a slave from them, i.e., a gentile slave, but they cannot acquire a slave from you, i.e., a Jewish slave, and they cannot acquire a slave from one another.

ולא הם קונים מכם למאי אילימא למעשה ידיו אטו גוי לא קני ליה לישראל למעשה ידיו והכתיב או לעקר משפחת גר ואמר מר משפחת גר זה הגוי אלא לאו לגופיה וקאמר רחמנא אתם קונין מהם אפילו גופיה

When it is derived that: But they cannot acquire slaves from you, to what type of acquisition is it referring? If we say it is for his labor, is that to say that a gentile cannot acquire a Jew for his labor? Isn’t it written: “And if a stranger who is a settler with you becomes rich, and your brother becomes poor beside him, and he sells himself to the stranger who is a settler with you, or to the offshoot of a stranger’s family” (Leviticus 25:47), and the Master said in explanation of the phrase “a stranger’s family” that this is referring to a gentile. If so, the verse explicitly states that a Jew can sell himself as a slave to a gentile. Rather, is it not that the reference is to selling his body, and the Merciful One states that you, i.e., Jews, can acquire a slave from them, which means even his body. Accordingly the verse indicates that a Jew can acquire a gentile slave’s body, but a gentile is unable to acquire ownership of another’s body, even that of another gentile.

פריך רב אחא אימא בכספא ובטבילה קשיא

Rav Aḥa refutes Rav Avya’s explanation: Say that the verse is referring to acquiring a gentile slave by both purchasing him with money and then by immersing him for the purpose of slavery, and only in that case does it teach that a Jew acquires the gentile slave’s body. However, until he has been immersed the acquisition is not fully complete, and therefore if the slave immerses himself with the intention to become free, then his immersion would achieve that end. The Gemara concedes: This is difficult.

אמר שמואל וצריך לתקפו במים

Shmuel said: And if one wishes to ensure that one’s slave does not declare the immersion to be for the sake of conversion, then one needs to hold him tightly in the water in a way that demonstrates the owner’s dominance over the slave at that time, thereby defining the immersion as one for the sake of slavery.

כי האי דמנימין עבדיה דרב אשי בעא לאטבולי מסריה ניהלייהו לרבינא ולרב אחא בריה דרבא אמר להו חזו דמינייכו קבעית ליה רמו ליה ארויסא בצואריה ארפו ליה וצמצמו ליה

That is as demonstrated in this incident involving Minyamin, Rav Ashi’s slave: When he wished to immerse him, he passed him to Ravina and Rav Aḥa, son of Rava, to perform the immersion on his behalf, and he said to them: Be aware that I will claim compensation for him from you if you do not prevent my slave from immersing for the sake of conversion. They placed a bridle [arvisa] upon his neck, and at the moment of immersion they loosened it and then immediately tightened it again while he was still immersed.

ארפו ליה כי היכי דלא להוי חציצה צמצמו ליה כי היכי דלא לקדים ולימא להו לשם בן חורין אני טובל בהדי דדלי רישיה ממיא אנחו ליה זולטא דטינא ארישיה ואמרו ליה זיל אמטי לבי מרך

The Gemara explains their actions: They initially loosened it in order that there should not be any interposition between the slave and the water during the immersion, which would invalidate it. They immediately tightened it again in order that the slave should not preempt them and say to them: I am immersing for the sake of becoming a freeman. When he lifted his head from the water they placed a bucket of clay upon his head and said to him: Go and bring this to the house of your master. They did this in order to demonstrate that the immersion had been successful and that he was still a slave.

אמר ליה רב פפא לרבא חזי מר הני דבי פפא בר אבא דיהבי זוזי לאינשי לכרגייהו ומשעבדי בהו כי נפקי צריכי גיטא דחירותא או לא

Rav Pappa said to Rava: Has the Master seen those of the house of Pappa bar Abba who give money to the tax-collectors on behalf of poor people to pay for their poll tax [karga], and as a result they would enslave them. Anyone who did not pay the tax would be taken as a slave for the king. By paying for such people’s taxes, the members of the house of Pappa bar Abba essentially purchased those people, who had become the king’s slaves, for themselves. Rav Pappa asked: When those slaves go free, do they require a bill of emancipation, because the members of the house of Pappa bar Abba actually attained ownership of the slaves’ bodies, or not, as they were owned only for the sake of their labor?

אמר ליה איכו שכיבי לא אמרי לכו הא מילתא הכי אמר רב ששת מוהרקייהו דהני בטפסא דמלכא מנח ומלכא אמר מאן דלא יהיב כרגא משתעבד למאן דיהיב כרגא

He said to him: Were I dead I could not say this matter to you, so it is good that you have asked me while I am still alive, as I know that this is what Rav Sheshet said with regard to the matter: The writ of slavery [moharkayehu] of these residents of the kingdom rests in the treasury [tafsa] of the king, and in fact all the residents of the kingdom are considered to be full slaves of the king, i.e., he owns their bodies, irrespective of whether they pay their taxes. And so when the king says: One who does not give the poll tax is to be enslaved to the one who does give the poll tax on his behalf, the king’s decree is fully effective in making those residents full slaves of those who paid for them. As such, they will require a bill of emancipation when they are freed.

רבי חייא בר אבא איקלע לגבלא חזא בנות ישראל דמעברן מגרים שמלו ולא טבלו וחזא חמרא דישראל דמזגי גוים ושתו ישראל וחזא תורמוסין דשלקי גוים ואכלי ישראל ולא אמר להו ולא מידי

§ The Gemara relates: Rabbi Ḥiyya bar Abba once happened to come to Gavla. He saw Jewish women there who had become pregnant from converts who were circumcised but had still not immersed to complete their conversion process; and he saw wine of Jews that gentiles were pouring, and Jews were drinking it; and he saw lupines [turmusin] that gentiles were cooking, and Jews were eating them; but he did not say anything to them.

אתא לקמיה דרבי יוחנן אמר ליה צא והכרז על בניהם שהם ממזרים ועל יינם משום יין נסך ועל תורמוסן משום בישולי גוים לפי שאינן בני תורה

Later, he came before Rabbi Yoḥanan and told him what he had witnessed. Rabbi Yoḥanan said to him: Go and make a public declaration concerning their children that they are mamzerim, and concerning their wine that it is forbidden because it is like wine poured as an idolatrous libation, and concerning their lupines that they are forbidden because they are food cooked by gentiles. One should be stringent and make such a declaration because they are not well-versed in Torah, and if they are left to be lax in this regard they will eventually transgress Torah prohibitions.

על בניהן שהם ממזרים רבי יוחנן לטעמיה דאמר רבי חייא בר אבא אמר רבי יוחנן לעולם אין גר עד שימול ויטבול וכיון דלא טביל גוי הוא ואמר רבה בר בר חנה אמר רבי יוחנן גוי ועבד הבא על בת ישראל הולד ממזר

The Gemara explains: With regard to the declaration concerning their children that they are mamzerim, Rabbi Yoḥanan conforms to his standard line of reasoning in two halakhot: The first is as Rabbi Ḥiyya bar Abba said that Rabbi Yoḥanan said: One is never considered to be a convert until he has been circumcised and has immersed. And since the convert in the case in Gavla had not immersed, he is still considered a gentile. And the second halakha is as Rabba bar bar Ḥana said that Rabbi Yoḥanan said: With regard to a gentile or a slave who engaged in intercourse with a Jewish woman, the offspring of that union is a mamzer.

ועל יינם משום יין נסך משום לך לך אמרין נזירא סחור סחור לכרמא לא תקרב

And the reason to declare concerning their wine that it is forbidden because it is like wine poured as an idolatrous libation is that although their wine was not actually poured as an idolatrous libation, it was prohibited by rabbinic decree due to the maxim that: Go, go, we say to a nazirite, go around and go around, but do not come near to the vineyard. Although a nazirite is prohibited only from eating produce of the vine, he is warned not even to come into close proximity of a vineyard as a protective measure to ensure that he will not transgress this prohibition. So too, in many cases, the Sages decreed certain items and actions to be prohibited because they understood that if people would partake of them, they would eventually transgress Torah prohibitions.

ועל תורמוסן משום בשולי גוים לפי שאינן בני תורה הא בני תורה שרי והאמר רב שמואל בר רב יצחק משמיה דרב כל הנאכל כמות שהוא חי אין בו משום בשולי גוים והא תורמוס אינו נאכל כמות שהוא חי ויש בו משום בשולי גוים

And the final declaration concerning their lupines that they are forbidden because they are food cooked by gentiles is issued because they are not well versed in Torah. The Gemara expresses astonishment: Does this imply that were they students of the Torah their lupines would be permitted? Didn’t Rav Shmuel bar Rav Yitzḥak say in the name of Rav: Any food item that is eaten as it is, raw, is not subject to the prohibition of food cooked by gentiles, even when cooked by them? But a lupine is not eaten as it is, raw, and therefore it is subject to the prohibition of food cooked by gentiles.

רבי יוחנן כאידך לישנא סבירא ליה דאמר רב שמואל בר רב יצחק משמיה דרב כל שאין עולה על שולחן מלכים לאכול בו את הפת אין בו משום בשולי גוים וטעמא דאינן בני תורה הא בני תורה שרי

The Gemara explains that Rabbi Yoḥanan holds in this matter in accordance with the opinion of the other version of what Rav Shmuel bar Rav Yitzḥak said in the name of Rav: Any food item that lacks sufficient importance such that it does not appear on the table of kings in order to eat bread with it is not subject to the prohibition of food cooked by gentiles. Lupines lack importance and are therefore permitted even if cooked by gentiles. And consequently, the only reason to make a declaration prohibiting the residents of Gavla from eating them is because they are not well versed in Torah, and if they are left to be lax in this regard they will eventually become lax in actual Torah prohibitions; by inference, to those well versed in Torah, it is permitted.

תנו רבנן גר שמל ולא טבל רבי אליעזר אומר הרי זה גר שכן מצינו באבותינו שמלו ולא טבלו טבל ולא מל רבי יהושע אומר הרי זה גר שכן מצינו באמהות שטבלו ולא מלו וחכמים אומרים טבל ולא מל מל ולא טבל אין גר עד שימול ויטבול

§ During their sojourn in Egypt, the children of Israel had the halakhic status of gentiles. At the revelation at Sinai they entered into a national covenant with God in which they attained their status of the Jewish people. This transformation was essentially the mass conversion of the people, and so their preparation for the revelation provides a paradigm of the process required for conversion for all generations. The tanna’im disagree as to which aspects of that original conversion are to be derived for all generations.
The Sages taught in a baraita: With regard to a convert who was circumcised but did not immerse, Rabbi Eliezer says that this is a convert, as so we found with our forefathers following the exodus from Egypt that they were circumcised but were not immersed. With regard to one who immersed but was not circumcised, Rabbi Yehoshua says that this is a convert, as so we found with our foremothers that they immersed but were not circumcised. And the Rabbis say: Whether he immersed but was not circumcised or whether he was circumcised but did not immerse, he is not a convert until he is circumcised and he immerses.

ורבי יהושע נמי נילף מאבות ורבי אליעזר נמי נילף מאמהות וכי תימא אין דנין אפשר משאי אפשר

The Gemara questions the opinions in the baraita: But let Rabbi Yehoshua also derive what is required for conversion from our forefathers; why didn’t he do so? And let Rabbi Eliezer also derive the halakha from our foremothers; why didn’t he do so? And if you would say that Rabbi Eliezer did not derive the halakha from our foremothers because he holds one cannot derive the possible from the impossible, i.e., one cannot derive that men do not require circumcision from the halakha that women do not require it, because for women it is a physical impossibility, that claim may be refuted.

והתניא רבי אליעזר אומר מנין לפסח דורות שאין בא אלא מן החולין נאמר פסח במצרים ונאמר פסח בדורות מה פסח האמור במצרים אין בא אלא מן החולין אף פסח האמור לדורות אין בא אלא מן החולין

It would appear that Rabbi Eliezer does not accept that principle, as isn’t it taught in a baraita that Rabbi Eliezer says: From where is it derived with regard to the Paschal lamb brought throughout the generations that it may be brought only from non-sacred animals? A Paschal lamb is stated in the Torah in reference to the lamb that the Jewish people brought prior to the exodus from Egypt, and a Paschal lamb is stated in reference to the yearly obligation throughout the generations. The association between them teaches that just as the Paschal lamb stated in reference to Egypt was only brought from non-sacred animals, since prior to the giving of the Torah there was no possibility to consecrate property, so too, with regard to the Paschal lamb stated in reference to the obligation throughout the generations, it may be brought only from non-sacred animals.

אמר ליה רבי עקיבא וכי דנין אפשר משאי אפשר אמר ליה אף על פי שאי אפשר ראיה גדולה היא ונלמד הימנה

Rabbi Akiva said to him: But can one derive the possible, i.e., the halakha for the Paschal lamb throughout the generations, where a possibility exists to bring it from consecrated animals, from the impossible, i.e., from the Paschal lamb in Egypt, where it was not a possibility? Rabbi Eliezer said to him: Although it was impossible to bring the Paschal lamb in Egypt from consecrated animals, nevertheless, it is still a great proof, and we may learn from it. It is apparent, then, that Rabbi Eliezer holds that one can derive the possible from the impossible. Therefore the original question stands: Why didn’t Rabbi Eliezer derive from the foremothers that circumcision is not essential for conversion?

אלא

The Gemara concedes: Rather, the baraita must be reinterpreted as follows:

בטבל ולא מל כולי עלמא לא פליגי דמהני כי פליגי במל ולא טבל רבי אליעזר יליף מאבות ורבי יהושע באבות נמי טבילה הוה

With regard to one who immersed but was not circumcised, everyone, i.e., both Rabbi Yehoshua and Rabbi Eliezer, agrees that the halakha is derived from the foremothers that immersion alone is effective. Where they disagree is with regard to one who was circumcised but had not immersed; Rabbi Eliezer derives that it is effective from the forefathers, and Rabbi Yehoshua disagrees because he maintains that in the conversion of the forefathers there was also an immersion.

מנא ליה אילימא מדכתיב לך אל העם וקדשתם היום ומחר וכבסו שמלתם ומה במקום שאין טעון כבוס טעון טבילה מקום שטעון כבוס אינו דין שטעון טבילה

The Gemara asks: From where did he derive this? If we say that he derived it from the fact that it is written that in preparation for the revelation at Sinai, God commanded Moses: “Go unto the people and sanctify them today and tomorrow, and let them wash their garments” (Exodus 19:10), as Rabbi Yehoshua understands that the washing mentioned in this verse is the ritual immersion of clothes, this leads to the following a fortiori inference: Just as in a case where one became impure through contact with some source of impurity, washing, i.e., immersion, of clothes is not required but immersion of one’s body is required, then in a case where washing of clothes is required, as in the preparation for the revelation at Sinai, isn’t it logical that immersion of one’s body should also be required?

ודלמא נקיות בעלמא

The Gemara rejects the proof: But perhaps when the verse states that they had to wash their clothes, it was merely for cleanliness and not for the sake of ritual purity. If so, no a fortiori inference can be drawn from it to the case of immersion for ritual purity.

אלא מהכא ויקח משה את הדם ויזרק על העם וגמירי דאין הזאה בלא טבילה

Rather, Rabbi Yehoshua derived it from here, where the verse states with regard to the formation of the covenant at Sinai: “And Moses took the blood and sprinkled it upon the people” (Exodus 24:8), and it is learned as a tradition that there is no ritual sprinkling without immersion. Therefore, our forefathers also must have immersed at Sinai, and consequently that is also an essential requirement for all conversions.

ורבי יהושע טבילה באמהות מנלן סברא הוא דאם כן במה נכנסו תחת כנפי השכינה

The Gemara asks: And with regard to the opinion of Rabbi Yehoshua, from where do we derive that also in the case of our foremothers there was immersion? The Gemara answers: It is based on logical reasoning, as, if so, that they did not immerse, then with what were they brought under the wings of the Divine Presence? Therefore, they also must have immersed.

אמר רבי חייא בר אבא אמר רבי יוחנן לעולם אינו גר עד שימול ויטבול פשיטא יחיד ורבים הלכה כרבים

Rabbi Ḥiyya bar Abba said that Rabbi Yoḥanan said: A man is never considered a convert until he is both circumcised and has immersed. The Gemara asks: Isn’t this obvious? In all disputes between an individual Sage and many Sages the halakha is in accordance with the opinion of the many Sages; it is therefore obvious that the halakha is in accordance with the Rabbis.

מאן חכמים רבי יוסי

The Gemara explains: Who are the Rabbis referred to in the baraita? It is Rabbi Yosei. Since Rabbi Yosei is merely an individual Sage, it was necessarily for Rabbi Yoḥanan to state explicitly that the halakha is ruled in accordance with his opinion.

דתניא הרי שבא ואמר מלתי ולא טבלתי מטבילין אותו ומה בכך דברי רבי יהודה רבי יוסי אומר אין מטבילין

Rabbi Yosei’s opinion is as it is taught in a baraita: With regard to a convert who came and said: I was circumcised for the sake of conversion but I did not immerse, the court should immerse him, as what would be the problem with that; this is the statement of Rabbi Yehuda. Since in any case the court immerses him, Rabbi Yehuda does not require proof of the convert’s claim that he was circumcised for the sake of conversion because he holds that it is sufficient to be either circumcised or immersed for the sake of conversion. Rabbi Yosei says: The court does not immerse him. He holds that both circumcision and immersion must be performed specifically for the sake of conversion and are indispensable parts of the conversion process. Therefore, since it is impossible to verify the convert’s claim with regard to his circumcision, there is no benefit to having him immerse.

לפיכך מטבילין גר בשבת דברי רבי יהודה ורבי יוסי אומר אין מטבילין

The baraita states a ramification of their dispute: Therefore, the court may immerse a convert who was already circumcised on Shabbat; this is the statement of Rabbi Yehuda. Since he holds that circumcision alone effected conversion, the immersion will not effect any further change in his status, and so it is permitted on Shabbat. And Rabbi Yosei says: The court may not immerse him. Since he holds that both circumcision and immersion are necessary to effect a conversion, the immersion will effect a change in his status by making him Jewish. Therefore it is prohibited to do so on Shabbat by rabbinic decree, because it appears similar to preparing a vessel for use.

אמר מר לפיכך מטבילין גר בשבת פשיטא כיון דאמר רבי יהודה בחדא סגיא היכא דמל לפנינו מטבילין מאי לפיכך

The Gemara analyzes the latter clause: The Master said in the baraita: Therefore, the court may immerse a convert who was already circumcised on Shabbat. The Gemara asks: Isn’t this an obvious extension of his opinion; since Rabbi Yehuda said that either one of circumcision or immersion is sufficient, where a convert was circumcised in our presence the court may certainly immerse him, even on Shabbat. What, then, is the need for the baraita to include the clause that begins with: Therefore?

מהו דתימא לרבי יהודה טבילה עיקר וטבילה בשבת לא דקא מתקן גברא קא משמע לן דרבי יהודה או הא או הא בעי

The Gemara explains: It is necessary to explicitly teach this ramification lest you say that according to Rabbi Yehuda the immersion is in fact the principal act that effects conversion, and when he said in the first clause that a convert who claims to have been circumcised should be immersed since there is no problem with that, his reasoning was that he holds it is only immersion that effects the conversion. And therefore performing the immersion on Shabbat would not be permitted, as it establishes the person with a new status and so would be prohibited by a rabbinic decree because it appears similar to preparing a vessel for use. The latter clause is therefore necessary to teach us that Rabbi Yehuda requires either this or that, i.e., either immersion or circumcision alone is sufficient to effect a conversion.

רבי יוסי אומר אין מטבילין פשיטא דכיון דאמר רבי יוסי תרתי בעינן תקוני גברא בשבת לא מתקנינן

The Gemara analyzes the next statement in the baraita: Rabbi Yosei says: The court may not immerse him. The Gemara asks: Isn’t this an obvious extension of his opinion? As, since Rabbi Yosei requires two acts, both circumcision and immersion, to effect conversion, we may certainly not establish that person with a new status on Shabbat by completing his conversion by immersing him.

מהו דתימא לרבי יוסי מילה עיקר והתם הוא דלא הואי מילה בפנינו אבל היכא דהויא מילה בפנינו אימא ליטבל זה בשבתא קא משמע לן דרבי יוסי תרתי בעי

The Gemara explains: It is necessary to explicitly teach this ramification lest you say that according to Rabbi Yosei circumcision is in fact the principal act that effects conversion, and it is only there, in the first clause of the baraita, where the circumcision was not performed in our presence and so there is no way to verify whether it was done for the sake of conversion, that Rabbi Yosei states that the court should not proceed to immerse him; however, where the circumcision was performed in our presence, one might say that the conversion was already effected by the circumcision, and therefore let us immerse this convert on Shabbat. The latter clause is therefore necessary to teach us that Rabbi Yosei requires two acts, both circumcision and immersion, to effect conversion.

אמר רבה עובדא הוה בי רבי חייא בר רבי ורב יוסף מתני רבי אושעיא בר רבי ורב ספרא מתני רבי אושעיא ברבי חייא דאתא לקמיה גר שמל ולא טבל אמר ליה שהי כאן עד למחר ונטבלינך

Rabba said: There was an incident in the house of Rabbi Ḥiyya bar Rabbi, and as Rav Yosef teaches it, Rabbi Oshaya bar Rabbi was also present, and as Rav Safra teaches it, a third Sage, Rabbi Oshaya, son of Rabbi Ḥiyya, was also present, in which a convert came before him who was circumcised but had not immersed. He said to the convert: Remain here with us until tomorrow, and then we will immerse you.

שמע מינה תלת שמע מינה גר צריך שלשה ושמע מינה אינו גר עד שימול ויטבול ושמע מינה אין מטבילין גר בלילה ונימא שמע מינה נמי בעינן מומחין דלמא דאיקלעו

Rabba said: Learn from this incident three principles: Learn from it that a convert requires a court of three people to preside over the conversion, as Rav Safra taught that the case involved three Sages. And learn from it that one is not considered to be a convert until he has been both circumcised and immersed. And learn from it that the court may not immerse a convert at night, as they instructed him to remain there until the following day. The Gemara suggests: And let us say that one should also learn from it that we require a court of experts to preside over the conversion, as Rav Safra identified that three expert Sages were present. The Gemara rejects this: Perhaps they simply happened to be there, but in fact three laymen would suffice.

אמר רבי חייא בר אבא אמר רבי יוחנן גר צריך שלשה משפט כתיב ביה

Rabbi Ḥiyya bar Abba said that Rabbi Yoḥanan said: A convert requires a court of three to preside over conversion, because “judgment,” is written with regard to him, as the verse states: “And one judgment shall be both for you and for the convert that sojourns with you” (Numbers 15:16), and legal judgments require a court of three judges.

תנו רבנן מי שבא ואמר גר אני יכול נקבלנו תלמוד לומר אתך במוחזק לך בא ועדיו עמו מנין תלמוד לומר וכי יגור אתך גר בארצכם

The Sages taught in a baraita: With regard to someone who came and said: I am a convert, one might have thought that we should accept him; therefore, the verse states: “And if a convert sojourns with you in your land, you shall not oppress him” (Leviticus 19:33). The emphasis on “with you” suggests that only someone who was already presumed by you to be a valid convert should be accepted as a convert. If he came and brought witnesses to his conversion with him, from where is it derived that he is to be accepted? It is from the beginning of that verse, which states: “And if a convert sojourns with you in your land.”