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1. Rav Huna: The first emission of a Zav counts even if it came about as a result of an Ones, a circumstance beyond his control.
2. When the Mishnah says that we examine the first and second emission of a Zav, it means two different things.
3. There is a dispute about whether a third emission due to an Ones obligates a Zav to bring a Korban.
4. Beis Shamai differentiates between a woman who counted seven days after being Yoledes b'Zavah and one who did not count seven days.
5. The Gemara derives a number of laws from the words, "Devosah Titma."
A BIT MORE
1. Rav Huna derives this law from the verse that lists a Zav next to a man who emits Keri. Just as one who emits Keri is Tamei whether his emission was intentional or not, the first time emission of a Zav counts even if it came about as a result of an Ones, a circumstance beyond his control.
2. We examine the first emission of a Zav to see whether it was due to an Ones, in order to determine whether he must bring a Korban due to this emission (if he sees two more). We examine the second emission in order to be certain that he is Tamei, as he is not considered Tamei if his second emission is due to an Ones.
3. Rabanan: Even if his third emission is due to an Ones, he still must bring a Korban. Rebbi Eliezer: If his third emission is due to an Ones, he does not bring a Korban.
4. The law of the Mishnah -- that the blood of a woman who gave birth while a Zavah is Tamei whether it is wet or dry -- is only because she did not yet count seven clean days after the birth. If she has counted seven days, even though she has not yet immersed in a Mikvah, Beis Shamai would say that the blood is Tamei only when wet.
5. These words teach that a man who has relations with a Nidah is Tamei like a Nidah herself, that the nights are included along with the days, and that a Yoledes b'Zov must have seven clean days in order to become Tahor.
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