The Gemara asks that perhaps the verse in Yechezkel -- "... and uncut hair
they may not grow" -- means that the Kohen may not grow his hair *at all*
("Lo Lirbu Klal").
How can the Gemara make such a suggestion? The Gemara just told us that there
is a Gezeirah Shavah that teaches that the Kohen is allowed to grow his hair
for 30 days!
(a) RASHI (according to the Girsa as corrected by the Menachem Meshiv Nefesh,
that the word "b'Chol" should be "b'Chaf-Tes") and TOSFOS answer that the
Gemara does not mean to ask that the Kohen must cut his hair everyday.
Rather, the Gemara means to ask that perhaps the Kohen is not allowed to grow
his hair for 30 complete days, but only for 29 days, and he must cut his hair
on the thirtieth day.
This approach explains the Gemara's question within the context of the
teaching of the Gezeirah Shavah. However, the Gemara asks clearly that the
Kohen should not be able to grow his hair "at all" ("Klal"), and not even for
29 days! The BACH therefore suggests that the word "Klal" be deleted from the
Gemara.
However, we have no record of such a Girsa in the Rishonim, nor is any such
Girsa cited by the Dikdukei Sofrim.
(b) The CHESHEK SHLOMO quotes his brother, the MAR'EH KOHEN, who says that
according to Rashi and Tosfos, the text of the Gemara should read, "Kol
Lamed" -- "all thirty days," instead of "Klal" (that is, the letters Kaf-
Lamed-Lamed were accidentally placed together by the printer, and they should
be separated to read "Kol Lamed"). Thus, the Gemara is asking that perhaps
the Kohen is not allowed to let his hair grow for a complete 30 days, as
Rashi and Tosfos explain.
(c) RAV YEHUDAH LANDY suggested another way to explain the Gemara according
to Rashi and Tosfos. When the Gemara asks that the Kohen should not grow
"it" at all, it does not mean that he should not grow "his hair" at all.
Rather, it means he should not grow "Pera" at all. What is "Pera?" "Pera"
refers to hair that has grown for a period of 30 days. Thus, the Gemara is
asking that perhaps the Kohen is not allowed to grow his hair for 30 days
(Pera), but he must cut his hair after 29 days (and not let it grow for 30,
which would be Pera, and then cut it). The Gemara answers that it can be
learned from the verse that the Kohen *may* grow Pera, however he must cut it
immediately after it reaches the stage of Pera.
(d) The CHIDUSHEI HA'RAN (Sanhedrin 22b) and the KEREN ORAH (here) explain
that the Gezeirah Shavah is not a real Gezeirah Shavah to begin with. The
verse that says that Kohanim may not let their hair grow is a verse in
Yechezkel. A Gezeirah Shavah from a verse in the Torah to a verse in Nevi'im
is not a real Gezeirah Shavah (cf. Chagigah 10b). It is only a Giluy Milsa.
Therefore, Abaye asks that since it is not a real Gezeirah Shavah, there is
no imperative to learn anything from Nazir. If so, the Gemara asks, perhaps a
Kohen may not grow his hair at all, literally, and he must shave his head
every day.