Sifrei Bamidbar 32

(Bamidbar 6:13) "This is the law of the Nazirite": "This," for the offering of purity (i.e., when the Nazirite is in a state of purity) or also for the offering of tumah (i.e., when the Nazirite is in a state of tumah)? (Ibid.) "On the day of the fulfillment of the days of his Naziritism" — Scripture is speaking only of one who has an end to his Naziritism (i.e., a thirty-day Naziritism, a Naziritism of purity) "This is the law of the Nazirite": (i.e., the offerings that follow) obtain with both a Nazirite of "days" and with an "eternal" Nazirite. "yavi otho (to the door of the tent of meeting"): Now do others bring him? ([this being the usual connotation of "yavi otho"]). Does he not bring (i.e., present) himself? — This is one of the three ethim (as in "otho") which R. Yishmael would expound in the Torah as (being reflexive,) "himself" (rather than accusative, "it" or "him"). Similarly, (Vayikra 22:16) "And they will bear otham the sin of guilt": Now do others bear them? Is it not they who bear upon themselves, etc.? Similarly, (Devarim 34:6) "And he buried otho in the valley." Now did others bury him? Did he not bury himself? Here, too, "yavi otho" — he brings (i.e., presents) himself, and others do not bring him.