Shamai and Hillel argue about a woman who sees blood and had been touching pure items before. Do the items that she was touching become impure retroactively? If so, from when? The Rabbis take the middle ground between the two opinions. What is the reason behind Shamai Hillel’s opinions? The gemara brings two mishnayot that…

The gemara brings two different explanations for the debate between Rabbi Shimon and the rabbis regarding mikveh. The gemara brings three other explanations for understanding the root of the debate in the mishna between Shamai and Hillel.

In the case of a basket how doese Chizkiya say the contents are pure in his debate with Rabbi Yochanan when Shamai and Hillel agree that they are impure. Four explanations are given – each one states that the case of Chizkiya and Rabbi Yochanan is different from the case of Shamai and Hillel. What…

What is the halacha regarding spots of blood on women’s clothing? Does it create a problem for impurities retroactively? Is there a difference in this halacha between women who menstruate regularly and those who don’t? Are the two internal examinations before and after intercourse considered a good internal exam (so that anything before will not…

A braita is brought to support Rava’s opinion that from a kal vachomer (logical argument) one can learn that even items the woman sat on within the period of 24 hours before she saw blood or from her last examination carry high level impurity (items that are sat on or lied upon can make a…

A dough at the stage where challa can be taken is already considered like challa for purposes of impurities (if a case of doubt arises). The gemara assumes that dough from which challa is ready to be taken but hasn’t yet been taken is like non sacred items that people treat like truma and therefore…

Shmuel and Rabbi Elazar hold like Rabbi Eliezer in four cases. However the gemara raises questions on this as it seems there are other cases where they also hold like Rabbi Eliezer. What is the definition of a virgin in the mishna? Why is that definition not mentioned as one of the three types of virgins…

When is a woman considered pregnant to determine that she is considered as one who doesn’t bleed and we don’t retroactively invalidate her pure items she had dealt with before she saw blood? Are bodily signs of pregnancy taken into consideration? When is a woman considered “nursing” who is assumed not to have a regular…

In what ways are the laws different for a girl who hasn’t yet reached an age where girls generally menstruate and yet she has seen blood?

Are there two different categories within the four women who are considered that they don’t bleed, such that there is a difference in the law regarding the second time one sees after not seeing? What is the law regarding one who gets here period based on some outside factors (i.e. jumping)? Can one create a…