Nazir 6A

אלא לבר פדא קשיא!

However, according to bar Padda this is difficult. Why doesn’t he shave his hair on the 30th day of each term of naziriteship?

אמר לך בר פדא, אימא סיפא: ואם גילח את הראשונה ליום שלשים ⁠— מגלח את השניה ליום ששים. אלא, סיפא מסייעא ליה, רישא ⁠— באומר שלימים.

The Talmud answers: Bar Padda could have said to you: Say the latter clause of the Mishnah: And if he shaved his hair for the first term on the 30th day, he shaves his hair for the second term on the 60th day. This demonstrates that the periods of naziriteship really last only 29 days. Rather, the latter clause of the Mishnah supports his opinion, whereas the earlier clause of the Mishnah, which teaches that he shaves his hair on the 31st and 60-first days, is referring to one who says that his naziriteship will be for 30 complete days.

ולרב מתנא קשיא סיפא! אמר לך רב מתנא, כדקתני סיפא: יום שלשים עולה לכאן ולכאן.

The Talmud now asks: And according to Rav Mattana, the latter clause of the Mishnah is difficult. The Talmud answers that Rav Mattana could have said to you that it is as the latter clause teaches: The 30th day counts for both this and that, i.e., it is considered both the last day of the first term of naziriteship, as well as the 1st day of the second term.

מאי היא ⁠— מקצת היום ככולו? הא אמרה חדא זימנא! מהו דתימא: הני מילי לענין חדא נזירות, אבל לשתי נזירות ⁠— לא, קא משמע לן.

The Talmud asks: What is the novelty of the latter clause of the Mishnah? Is it that the legal status of part of the day is like that of an entire day? But didn’t he already say this once in an earlier clause in that Mishnah, as explained above? The Talmud answers: The latter clause was necessary; lest you say that this principle applies only with regard to one term of naziriteship, but with regard to two terms of naziriteship, no, this principle does not apply, the tanna therefore teaches us that part of the day is like that of an entire day, even to allow counting the beginning of the day as the last day of one term of naziriteship and the end of the day as the 1st day of another term of naziriteship.