The mishnah identified the person handling the offering with the status of a “tevul yom” — one who is waiting until nightfall for the purity effected by immersing in the mikveh earlier in the day to kick in — as one whose offering would not be valid. So the search for the source for this conclusion is undertaken by the Gemara – including a comparison to shaving the head and/or points of the face. Also, a sampling of the establishment of norms for those who might bring such a korban – in this case, a zav or one akin to a zav, with an unhealthy seminal emission (one who is a mehusar kippurim) – with a connection to the red heifer.
Zevahim 17: Levels of Impurity
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