Numbers 6:6-8

Amplified Bible

⁶ ‘All the time that he separates himself to the Lord he shall not go near a dead body. ⁷ He shall not make himself [ceremonially] unclean for his father, mother, brother, or sister, when they die, because [the responsibility for] his separation to God is on his head. ⁸ All the time of his separation he is holy to the Lord.