Numbers 6:5-7

New Catholic Bible

⁵ No razor will touch his head all throughout the time of his vow. He is to be holy until the days of his vow have been completed. He will let the hair on his head grow long. ⁶ He is not to approach any dead body during the entire period of his vow to the Lord. ⁷ He is not to make himself unclean even for his father or mother if they were to die, nor his brother or sister, for the consecration of God is upon his head.