Numbers 6:11

11 The priest will offer one for the Absolution-Offering and one for the Whole-Burnt-Offering, purifying you from the ritual contamination of the corpse. You resanctify your hair on that day

Numbers 6:11 Meaning and Commentary

Numbers 6:11

And the priest shall offer the one for a sin offering, and
the other for a burnt offering
That is, one of the turtles or young pigeons for the one kind of sacrifice, and one for the other sort; both being necessary; the one to expiate sin, and the other as a gift to God by way of thankfulness for acceptance of the former:

and make an atonement for him, for that he sinned by the dead;
by being where the dead body was, which, though not sinful, in a moral sense, was, in a ceremonial one, and therefore required a sacrifice to atone for it; and which atonement was made by the sin offering typical of Christ, who was made an offering for sin:

and shall hallow his head the same day;
consecrate himself to God afresh, particularly the hair of his head, let that grow again and begin his Nazariteship anew; so Jarchi interprets it, to return and begin the account of his Nazariteship.

Numbers 6:11 In-Context

9 "If someone should die suddenly in your presence, so that your consecrated head is ritually defiled, you must shave your head on the day of your purifying, that is, the seventh day.

10 Then on the eighth day bring two doves or two pigeons to the priest at the entrance to the Tent of Meeting.

11 The priest will offer one for the Absolution-Offering and one for the Whole-Burnt-Offering, purifying you from the ritual contamination of the corpse. You resanctify your hair on that day

12 and reconsecrate your Nazirite consecration to God by bringing a yearling lamb for a Compensation-Offering. You start over; the previous days don't count because your consecration was ritually defiled.

13 "These are the instructions for the time set when your special consecration to God is up. First, you are to be brought to the entrance to the Tent of Meeting.