Nazir 3:5-6

Nazir 3:5

If a person accepted nezirus upon himself while in a cemetery, even if he stayed there for 30 days, they don’t count and he doesn’t bring a sacrifice for being rendered ritually unclean (because his status as a nazir never took effect). If he left the cemetery and returned to it, those days count and he must bring a sacrifice for being rendered unclean. Rabbi Eliezer says the day doesn’t count if he is rendered unclean on Day 1 because Numbers 6:12 says, “he will forfeit the previous days,” from which we see that he must have previous days.

Nazir 3:6

If a person committed to an extended period of nezirus and he observed it outside of Israel (where nezirus cannot be fulfilled), then he later came to Israel, Beis Shammai say he must be a nazir in Israel for 30 days, while Beis Hillel say he must observe the whole thing. Queen Helena was a convert to Judaism who ruled a foreign land. When her son went to war, she committed that if he returned safely, she would observe nezirus for seven years. When he returned safely, she observed nezirus for seven years, after which she went to Israel. Beis Hillel told her that she had to observe another seven years. At the end of the seven years, she was rendered unclean so she had to do it again, for a total of 21 years. Rabbi Yehuda says that she was only a nazir for 14 years (because she didn’t become unclean).