Numbers 6:5-7

New International Version - UK

⁵ ‘“During the entire period of their Nazirite vow, no razor may be used on their head. They must be holy until the period of their dedication to the Lord is over; they must let their hair grow long.

⁶ ‘“Throughout the period of their dedication to the Lord, the Nazirite must not go near a dead body. ⁷ Even if their own father or mother or brother or sister dies, they must not make themselves ceremonially unclean on account of them, because the symbol of their dedication to God is on their head.