Numbers 6:2; Numbers 6:5

2 "Speak to the sons of Israel and say to them, 'When a man or woman makes a special vow, the vow of a Nazirite, to dedicate himself to the LORD ,

5 'All the days of his vow of separation no razor shall pass over his head. He shall be holy until the days are fulfilled for which he separated himself to the LORD ; he shall let the locks of hair on his head grow long.