Reference for Pesachim 8:5

זָב שֶׁרָאָה שְׁתֵּי רְאִיּוֹת, שׁוֹחֲטִין עָלָיו בַּשְּׁבִיעִי. רָאָה שָׁלֹשׁ, שׁוֹחֲטִין עָלָיו בַּשְּׁמִינִי שֶׁלּוֹ. שׁוֹמֶרֶת יוֹם כְּנֶגֶד יוֹם, שׁוֹחֲטִין עָלֶיהָ בַשֵּׁנִי שֶׁלָּהּ. רָאֲתָה שְׁנֵי יָמִים, שׁוֹחֲטִין עָלֶיהָ בַשְּׁלִישִׁי. וְהַזָּבָה, שׁוֹחֲטִין עָלֶיהָ בַשְּׁמִינִי:

If a zav had two sightings, [in which instance he is unclean for seven days and does not require an offering (of atonement)], it (the Pesach) may be slaughtered for him on the seventh day [even though "his sun did not set" (this, provided that he immerse at the time of slaughtering), for he is fit to eat it at night. For it is only one who is unclean through a dead body, whose seventh day falls out on the fourteenth, who is pushed off to Pesach sheni, even though he is fit to eat it at night, as it is written (Numbers 9:6): "And there were men who were unclean by the body of a man, and they could not make the Pesach on that day" — They could not do so on that day, but they could eat the Pesach in the evening — and they were pushed off to Pesach sheni. But for other types of uncleanliness, if he is fit to eat it in the evening, it is slaughtered for him, even though his sun has not set.] If he had three sightings, [in which instance he is not fit to eat until he brings atonement (offerings)], it is slaughtered for him on his eighth day [i.e., if his eighth day fell out on Pesach eve, even if he did not bring his atonement (this, on condition that he give his (atonement) offerings to beth-din.)] A woman who observes day (of cleanliness) against day (of uncleanliness) [i.e., if she had a sighting in the eleven days between one niddah sequence and the next, in which instance she must count the next day (as a day of cleanliness)], it is slaughtered for her on her second day [i.e., on the day of her counting. For once she counts part of the day, she is permitted to immerse. And even though her sun has not set, it is slaughtered for her.] If she had sightings on two (consecutive) days, it is slaughtered for her on the third day. And a zavah [i.e., if she saw three consecutive days within the eleven days, in which instance she must count seven clean days and bring an offering (of atonement)], it is slaughtered for her on the eighth day.

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