Numbers 6:9-11

9And if any man die very suddenly beside him, and he defile the head of his separation; then he shall shave his head in the day of his cleansing, on the seventh day shall he shave it.

10And on the eighth day he shall bring two turtledoves, or two young pigeons, to the priest, to the door of the tent of meeting:

11and the priest shall offer one for a sin offering, and the other for a burnt offering, and make atonement for him, for that he sinned by reason of the dead, and shall hallow his head that same day.