Numbers 6
5 Ref All the time he is under his oath let no blade come near his head; till the days while he is separate are ended he is holy and his hair may not be cut.
6 Ref All the time he is separate he may not come near any dead body.
7 Ref He may not make himself unclean for his father or his mother, his sister or his brother, if death comes to them; because he is under an oath to keep himself separate for God.
8 Ref All the time he is separate he is holy to the Lord.
9 Ref If death comes suddenly to a man at his side, so that he becomes unclean, let his hair be cut off on the day when he is made clean, on the seventh day.