Numbers 6:6-11

6All the days that he separateth himself unto the LORD he shall not come near to a dead body.

7He shall not make himself unclean for his father, or for his mother, for his brother, or for his sister, when they die: because his separation unto God is upon his head.

8All the days of his separation he is holy unto the LORD.

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.