Leviticus 27:1-10

Now the LORD spoke to Moses, saying, “Speak to the children of Israel, and say to them: ‘When a man consecrates by a vow certain persons to the LORD, according to your valuation, if your valuation is of a male from twenty years old up to sixty years old, then your valuation shall be fifty shekels of silver, according to the shekel of the sanctuary. If it is a female, then your valuation shall be thirty shekels; and if from five years old up to twenty years old, then your valuation for a male shall be twenty shekels, and for a female ten shekels; and if from a month old up to five years old, then your valuation for a male shall be five shekels of silver, and for a female your valuation shall be three shekels of silver; and if from sixty years old and above, if it is a male, then your valuation shall be fifteen shekels, and for a female ten shekels. ‘But if he is too poor to pay your valuation, then he shall present himself before the priest, and the priest shall set a value for him; according to the ability of him who vowed, the priest shall value him. ‘If it is an animal that men may bring as an offering to the LORD, all that anyone gives to the LORD shall be holy. He shall not substitute it or exchange it, good for bad or bad for good; and if he at all exchanges animal for animal, then both it and the one exchanged for it shall be holy.