Leviticus 27:2-4

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, 27:3 the conversion value of the male from twenty years old up to sixty years old is fifty shekels by the standard of the sanctuary shekel. 27:4 If the person is a female, the conversion value is thirty shekels.