Numbers 6:5-9

5“‘All the days of the vow of his separation no razor may be used on his head until the time is fulfilled for which he separated himself to the Lord. He will be holy, and he must let the locks of hair on his head grow long.

6“‘All the days that he separates himself to the Lord he must not contact a dead body.

7He must not defile himself even for his father or his mother or his brother or his sister if they die, because the separation for his God is on his head.

8All the days of his separation he must be holy to the Lord.

9“‘If anyone dies very suddenly beside him and he defiles his consecrated head, then he must shave his head on the day of his purification – on the seventh day he must shave it.