Leviticus 27:1-10

Again, the LORD spoke to Moses, saying, “Speak to the sons of Israel and say to them, ‘When a man makes a difficult vow, he shall be valued according to your valuation of persons belonging to the LORD. If your valuation is of the male from twenty years even to sixty years old, then your valuation shall be fifty shekels of silver, after the shekel of the sanctuary. Or if it is a female, then your valuation shall be thirty shekels. If it be from five years even to twenty years old then your valuation for the male shall be twenty shekels and for the female ten shekels. But if they are from a month even up to five years old, then your valuation shall be five shekels of silver for the male, and for the female your valuation shall be three shekels of silver. If they are from sixty years old and upward, if it is a male, then your valuation shall be fifteen shekels, and for the female ten shekels. But if he is poorer than your valuation, then he shall be placed before the priest and the priest shall value him; according to the means of the one who vowed, the priest shall value him. ‘Now if it is an animal of the kind which men can present as an offering to the LORD, any such that one gives to the LORD shall be holy. He shall not replace it or exchange it, a good for a bad, or a bad for a good; or if he does exchange animal for animal, then both it and its substitute shall become holy.