Leviticus 27:2

27:2 “Speak to the Israelites and tell them, ‘When a man makes a special votive offering based on the conversion value of persons to the Lord,

Leviticus 22:21

22:21 If a man presents a peace offering sacrifice to the Lord for a special votive offering or for a freewill offering from the herd or the flock, it must be flawless to be acceptable; it must have no flaw.