Zavim 1:1-2

Zavim 1:1

If a man has one zav emission, Beis Shammai say that he’s like a woman who counts a day for each day, while Beis Hillel say that he’s like one who had a seminal emission. If he has an emission but it stops the next day, and then he has two emissions on the third day, or if he had one emission that was as large as two, Beis Shammai say that he’s a full zav; Beis Hillel say that he renders unclean objects on which he sits or lies, and he must immerse in running water, but he need not bring an offering. Rabbi Elazar ben Yehuda said that Beis Shammai agree that such a person isn’t a full zav. Rather, they disagree about one who saw two emissions or a single emission that was as large as two, he stopped on the second day and he saw again on the third day. Beis Shammai say that such a person is a full zav, while Beis Hillel say that he renders unclean objects on which he sits or lies, and he must immerse in running water, but he need not bring an offering

Zavim 1:2

If a man has a seminal emission on the third day of counting from his zivah emission, Beis Shammai say that it cancels out the two previous days while Beis Hillel say that it only cancels out that one day. Rabbi Yishmael says that if one has a seminal emission on the second day, it cancels out the previous day. Rabbi Akiva says it doesn’t matter whether he saw it on the second day or the third day: Beis Shammai say it undoes the two previous days and Beis Hillel say it only undoes that one day. Both schools agree that if he has a seminal emission on the fourth day, it only cancels out that one day. That’s if he had a seminal emission but if he had a zav emission, then even if this happens on the seventh day, it cancels out all the days that preceded it.