(Beraisa - Rebbi): He cuts his hair once a year - "at the end of the term, from time to time"

Rebbi learns a Gezeirah Shavah "Yamim-Yamim" from (rights to redeem) a house (that one sold) in a walled city. Just like there, "Yamim" means 12 months, also, here.

R. Nehorai says, he cuts his hair every 30 days;

R. Yosi says, he cuts it every Erev Shabbos, for this is normal for sons of kings.

Question: How can Rebbi learn 12 months from the Gezeirah Shavah? Rebbi expounds that "Yamim" means two (he cannot redeem within two days)!

Answer: Avshalom would cut his hair "when it became too cumbersome." The Gezeirah Shavah cannot teach that this was after two days!

Suggestion: Perhaps we should learn two years, from a Gezeirah Shavah with "mi'Ketz Shenasayim Yamim"!

Rejection: Regarding Avshalom, it says only "Yamim", not years. We learn from a similar source (a house in a walled city), and not from "Shenasayim Yamim."

Suggestion: Perhaps we should learn one month, from a Gezeirah Shavah with "until a month of days"?

Rejection: We learn "Yamim" from "Yamim", and not from "Chodesh Yamim."

Suggestion: Perhaps we should learn from a Gezeirah Shavah with "mi'Yamim Yamimah"! (Benos Yisrael went four days every year, i.e. every three months, to cry over Yiftach's daughter.)

Rejection #1: We learn "Yamim" from "Yamim", and not from "Yamimah."

Question: We may learn from a different word!

(Tana d'Vei R. Yishmael): It says "V'Shav ha'Kohen... u'Va ha'Kohen." A Gezeirah Shavah (Shivah-Bi'ah) equates these.

Answer: If there is no better match, we may learn a Gezeirah Shavah between different words. If there are more similar words, we learn from them.

Rejection #2: We cannot learn from there. We have no source that the four days were evenly spaced throughout the year.

(Beraisa - R. Nehorai): He may cut his hair once every 30 days.

Kohanim cut their hair this often, because after this it is too long. The same applies to a Nazir Olam!

(Beraisa - R. Yosi): He may cut it every Erev Shabbos (for this is normal for princes).

Question: If so, how was Avshalom different than his brothers?

Answer #1: When Yom Tov fell during the week, his brothers would cut their hair on Erev Yom Tov, but he did not.

Answer #2: His brothers could cut their hair in the morning, but he would cut only in the afternoon (after bringing the Korbanos - Rosh).

Question: It says "at the end of 40 years." From when do they begin?

Answer (R. Nehorai): This is from when Yisrael requested a king;

(Beraisa): They requested a king in the 10th year of Shmuel's leadership over Yisrael.

(Mishnah): Stam (unspecified) Nezirus is 30 days.

(Gemara) Question: What is the source for this?

Answer #1 (Rav Masna): "Yihyeh (he will be) Kadosh" - the numerical value of Yihyeh is 30.

Answer #2 (Bar Pada): This corresponds to the 29 times "Nazir" (or variant forms) appears in this Parashah in the Torah.

Question: Why doesn't Rav Masna learn like Bar Pada?

Answer: Some of the occurrences are expounded to teach laws, so we may not count them:

"From wine and string drink Yazir" forbids wine of a Mitzvah just like optional wine;

"Lindor Neder Nazir Lehazir la'Shem" teaches that if a Nazir accepts Nezirus, he must fulfill it when he finishes his current Nezirus.

Defense of Bar Pada: Certainly, at least one of the 29 is not expounded. Since that one comes to teach about the duration of Stam Nezirus, all come for this.

(Mishnah): Stam Nezirus is 30 days.

Question: This is like Rav Masna, and refutes Bar Pada!

Answer (on behalf of Bar Pada): Since he shaves (and brings Korbanos) on the 30th day, the Tana considers the Nezirus to be 30 days.

(Mishnah): If one said 'I am a Nazir', he shaves on the 31st day.

Question: This is like Rav Masna. According to Bar Pada, he may shave on day 30!

Counter-question (Bar Pada - Seifa): If he shaved on day 30, he fulfilled the Nezirus.

The Seifa supports Bar Pada. The Reisha is a decree, due to one who accepted Nezirus for 30 full days.

Question: How does Rav Masna explain the Seifa?

Answer: He holds that Miktzas ha'Yom k'Kulo (observing Nezirus for part of the (30th) day is like the full day).

Question (Mishnah): If one said 'I am a Nazir for 30 days', if he shaved on day 30, he did not fulfill his vow. (This shows that Miktzas ha'Yom is not k'Kulo!)

Answer: The case is, he said 30 full days (some texts - it is as if he said 30 full days, i.e. surely he said '30' to obligate full days).

Question (Mishnah): If one accepted to be a Nazir twice, he shaves for the first Nezirus on day 31, and shaves for the second Nezirus on day 61.

This is like Rav Masna, and unlike Bar Pada!