Nazir (Hebrew: נזיר) is a treatise of the Mishnah and the Tosefta and in both Talmuds, devoted chiefly to a discussion of the laws of the Nazirite laid down in Numbers 6:1-21. In the Tosefta its title is Nezirut ("Nazariteness"). In most of the editions of the Mishnah this treatise is the fourth in the order Nashim, and it is divided into 9 chapters, containing 48 paragraphs in all.
Chapter 1: The different kinds of vows which involve compulsory Nazariteship (§§ 1-2); Nazariteship for life, Samson's Nazariteship (compare Judges 12:4 et seq.), and the difference between these two kinds (§ 2); Nazariteship is calculated by days only, not by hours, and generally lasts thirty days if no definite period is given (§ 3); different expressions which make a sort of lifelong Nazariteship compulsory, although the hair may be cut once in thirty days (§ 4); peculiar indefinite expressions used in connection with the vow (§§ 5-7).
Chapter 2: Whether vows which are expressed in a peculiar, incorrect manner are binding (§§ 1-2); cases in which a clearly expressed vow of Nazariteship is not binding (§ 3); vows made under conditions incompatible with Nazariteship (§ 4); combination of two Nazariteships, or of one with the vow to bring an additional sacrifice for a Nazarite; conditional vows (§§ 5-9).
Chapter 3: When a Nazarite may cut his hair in case he has vowed only one term of Nazariteship, or when he has vowed two successive terms (§§ 1-2); whether a Nazarite who has become unclean on the last day of his term must recommence his Nazariteship, and the cases in which he must do so (§§ 3-4); the case of one who vows Nazariteship while in a burial-place (§ 5); Nazariteship may be observed only in the Holy Land; Helena, Queen of Adiabene, once vowed Nazariteship for seven years, and fulfilled her vow; but when she went to the land of Israel at the end of the seventh year, the Bet Hillel decided that she must observe her vow for another period of seven years, since the time which she had spent outside of the land of Israel could not be taken into account (§ 6).