1)

(a)Based on Pesukim in Emor and Naso respectively, the Mishnah rules that both a Kohen Gadol and a Nazir - are prohibited from rendering themselves Tamei for a relative.

(b)They are both permitted, however, to be Metamei themselves - for a Meis Mitzvah (See Tos. Yom-Tov).

(c)According to Rebbi Eliezer, if they are both travelling and come across a Meis Mitzvah, the Kohen Gadol should render himself Tamei and not the Nazir. The Chachamim say - the Nazir should do so and not the Nazir.

(d)The reason that Rebbi Eliezer gives for his ruling is - that the Kohen Gadol does not bring a Korban on his Tum'ah (See Tos. Yom-Tov), whereas a Nazir does.

(e)The Chachamim explain - that a Nazir's Kedushah is not permanent (See Tos. Yom-Tov), whereas that of a Kohen Gadol is.

2)

(a)The first three items on the Tana's list of Tum'as for which a Nazir has to shave are 'Meis, ka'Zayis min ha'Meis and ka'Zayis Netzel'. A Meis, which need not be complete, is defined as - Rov Binyan or Rov Minyan (See Tos. Yom-Tov).

(b)Rov Binyan comprises the two calves and the thigh, Rov Minyan - a hundred and twenty-five limbs.

(c)If the Meis constitutes neither Rov Binyan nor Rov Minyan - then the Nazir shaves over a half a Kav of bones, as we shall see shortly.

(d)'ka'Zayis Netzel' is - the vapors that come off a corpse.

3)

(a)The next three items are 'M'lo Tarvad Rakav, Shedrah (the spinal cord) and Gulgoles (the skull)'. 'M'lo Tarvad Rakav' - is an extra-large spoonful (See Tos. Hyom-Tov) of the rot of a corpse.

(b)The Nazir must shave even if there is no flesh on ...

1. ... the Shedrah or on ...

2. ... the Gulgoles.

(c)The Tana then lists 'Eiver min ha'Chai and Eiver min ha'Meis she'Yesh alav Basar ka'Ra'uy'. 'ka'Ra'uy' - means enough flesh that will allow the rest to re-grow, if it would be attached to to a live person.

4)

(a)The last two items on the list are 'bones and blood'. For the Nazir to require shaving, the Shi'ur ...

1. ... for bones is- half a Kav.

2. ... blood is - half a Log.

(b)To reconcile this with the fact that a quarter Kav of bones and a quarter Log of blood is already Metamei be'Ohel - we ascribe the current ruling to Halachah le'Moshe mi'Sinai.

(c)All of the above require the Nazir to shave via Maga (touching), Masa (carrying) and Ohel. A barley-size bone, says the Mishnah - only requires him to shave via Maga and Masa, but not via Ohel.

(d)Besides shaving, after the Nazir has been sprinkled on the third and seventh days of his Tum'ah (based on the Pasuk "ve'ha'Yamim ha'Rishonim Yiplu") - he must negate his entire Nezirus and begin all over again ...

(e)... after he has become Tahor once again and brought all his Korbanos (See Tos. Yom-Tov).

5)

(a)The first three items on the Tana's list of Tum'os for which a Nazir does not shave are 'S'chachaos, Pera'os and Beis ha'P'ras'. 'S'chachos' refers to a tree with many branches with spaces between them - and it speaks where a Nazir passed underneath the branches, but does not remember which one.

(b)'Pera'os' refers to - stones slabs or planks that are jutting out of a wall (under the same circumstances as the branches in the previous case).

(c)The next two items are ...

1. ... 'Beis ha'Peras, which refers to - a gave that has been dug up in a field, consisting of a hundred square Amos which the Chachamim declared Tamei (because that is the distance that a plow disperses the bones (See Tos. Yom-Tov).

2. ... 'Eretz ha'Amim' - on which they decreed a Din Tum'ah (See Tos. Yom-Tov DH 've'Eretz ha'Amim' & 'u'Mazeh ... ').

6)

(a)The next two items are 'Golel ve'Dofek, and these are followed by Revi'is Dam, an Ohel of Rova Atzamos (See Meleches Sh'lomoh and Tos. Yom-Tov) and Keilim ha'Nog'im be'Meis'. 'Golel' is the cover of a coffin - 'Dofek' the coffin itself.

(b)If the Nazir touches or carries ...

1. ... a Revi'is ha'Log of blood - he does not have to shave (See Tos. Yom-Tov).

2. ... a Rova ha'Kav of fragmented bones of a corpse - he is Chayav to shave (See Tos.Yom-Tov).

(c)Vessels that touch a corpse - are included in the current list, for which the Nazir does not need to shave (See Tos.Yom-Tov).

7)

(a)The last two items are 'Y'mei Sifro and Y'mrei Gamro'. 'Y'mei Gamro' refers to the time when the Nazir is also a Metzora who is a Chalut (when a Metzora is sent outside the walls of the city); 'Y'mei Sifro' refers - the period following the termination of his Nezirus (about which the Torah writes "Veyashav mi'Chutz le'Ohalo Shiv'as Yamim").

(b)In all of the above cases, should the Nazir become Tamei - all the Dinim of a Tamei Meis pertain to him, but, neither does he need to shave (i.e. to begin his Nezirus all over again), nor does he need to bring ...

(c)... a Korban.

(d)He continues to count the remaining days of his Nezirus - as soon as he becomes Tahor (See Tos. Yom-Tov).

8)

(a)The Mishnah rules that a Nazir who becomes ...

1. ... a Zav, a Zavah or ...

2. ... a Metzora Musgar - counts all the days that this involves (including the seven clean days of the former) as part of the Nezirus.

(b)The opening words 'be'Emes Amru' - indicate that the ruling is Halachah (as is well-known).

9)

(a)Rebbi Eliezer quoting Rebbi Yehoshua said - that one only Chayav on Tum'as Mikdash for Tum'as Meis on which a Nazir has to shave, but not for those that he doesn't.

(b)Besides Bi'as Mikdash, this also incorporates - someone who eats Kodshim.

(c)Practically speaking, this means that, regarding the strict side of the connection, if the Tamei person entered the Beis ha'Mikdash or ate Kodshim ...

1. ... be'Meizid - he is Chayav Kareis.

2. ... be'Shogeg - he is Chayav a Korban Oleh ve'Yoreid.

10)

(a)Rebbi Meir queried the leniency (regarding the Tum'as which a Nazir does not have to shave) from a Tamei Sheretz - who is Chayav Kareis for entering the Beis-ha'Mikdash ... , how much more so a Tamei Meis!

(b)We know that someone who touches a Sheretz and enters the Beis-ha'Mikdash ... is Chayav from the Pasuk (in connection with the Korban Oleh ve'Yoreid) "O be'Nivlas Sheretz Tamei".

(c)We counter Rebbi Akiva's Pircha from the Din of Etzem ki'Se'orah and that of Revi'is Dam. There respective Dinim regarding ...

1. ... Tum'as Ohel are - that someone who touches or carries the former is Patur, and the latter, Chayav. Yet when it comes to ...

2. ... a Nazir having to shave - the former is Chayav, and the latter Patur (as we shall now see).

11)

(a)Rebbi Akiva asked Rebbi Eliezer from Etzem ki'Se'orah and Revi'is Dam (which we just explained) - that surely if Etzemki'Se'orah, which is not Metamei be'Ohel, yet a Nazir is Chayav to shave for touching or carrying it, then a Revi'is Dam, which is Metamei be'Ohel, will obligate a Nazir to shave!

(b)Rebbi Eliezer refuted Rebbi Akiva's Pircha - because, he said, a Kal va'Chomer is not applicable here.

(c)The reason for this is - on account of the principle that one cannot learn a Kal va'Chomer from a something that is Halachah le'Moshe mi'Sinai ...

(d)... such as Etzem ki'Se'orah obligating a Nazir to shave.

(e)Rebbi Yehoshua subsequently told Rebbi Akiva - that although logically, he was right, one cannot learn a Kal va'Chomer from a Halachah, just as Rebbi Eliezer had said.