Numbers 6:11

6:11 Then the priest will offer one for a purification offering and the other as a burnt offering, and make atonement for him, because of his transgression in regard to the corpse. So he must reconsecrate his head on that day.

Numbers 15:28

15:28 And the priest must make atonement for the person who sins unintentionally – when he sins unintentionally before the Lord – to make atonement for him, and he will be forgiven.