Numbers 6:2

6:2 “Speak to the Israelites, and tell them, ‘When either a man or a woman takes a special vow, to take a vow as a Nazirite, to separate himself to the Lord,

Numbers 6:12

6:12 He must rededicate to the Lord the days of his separation and bring a male lamb in its first year as a reparation offering, but the former days will not be counted because his separation was defiled.