Numbers 6:2; Numbers 6:5

2 “Speak to the Israelites and say to them: ‘If a man or woman wants to make a special vow, a vow of dedication to the LORD as a Nazirite,

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.