(2) Instruct Aaron and his sons to be scrupulous about the sacred donations that the Israelite people consecrate to Me, lest they profane My holy name, Mine the LORD’s.

וינזרו THAT THEY KEEP AWAY [FROM THE HOLY THINGS etc.] — The term נזר always denotes “keeping aloof". Similarly it is said (Ezekiel 14:7) "and he separates himself (וינזר) from following Me”; (Isaiah 1:4) "They are gone away (נזורו) backward”. The meaning of this verse therefore is: they (the priests) shall keep aloof from the holy things during the time of their uncleanness (Sifra, Emor, Section 4 1).

(6) the person who touches such shall be unclean until evening and shall not eat of the sacred donations unless he has washed his body in water. (7) As soon as the sun sets, he shall be clean; and afterward he may eat of the sacred donations, for they are his food.

(13) This is the ritual for the nazirite: On the day that his term as nazirite is completed, he shall be brought to the entrance of the Tent of Meeting.

 

 (16) The priest shall present them before the LORD and offer the sin offering and the burnt offering. 

מאשר חטא על הנפש [AND THE PRIEST … MAKE EXPIATION FOR HIM] FOR THAT HE HATH SINNED BY THE DEAD — i.e., that he has not been on his guard against defilement by a corpse. — R. Eleazer ha-Kappar said, “his sin consists in that he has afflicted himself by abstaining from the enjoyment of wine (Sifrei Bamidbar 30; Nazir 19a).

As it is taught in a baraita: Rabbi Elazar HaKappar, the esteemed one, says: What is the meaning when the verse states with regard to a nazirite: “And make atonement for him, for he sinned by the soul” (Numbers 6:11)? And with which soul did this person sin by becoming a nazirite? Rather, in afflicting himself by abstaining from wine, he is considered to have sinned with his own soul, and he must bring a sin-offering for the naziriteship itself, for causing his body to suffer. And an a fortiori inference can be learned from this: Just as this person, in afflicting himself by abstaining only from wine, is nevertheless called a sinner, in the case of one who afflicts himself by abstaining from everything, through fasting or other acts of mortification, all the more so is he described as a sinner.