Leviticus 27:8-10
Revised Standard Version
8 And if a man is too poor to pay your valuation, then he shall bring the person before the priest, and the priest shall value him; according to the ability of him who vowed the priest shall value him.
9 “If it is an animal such as men offer as an offering to the Lord, all of such that any man gives to the Lord is holy. 10 He shall not substitute anything for it or exchange it, a good for a bad, or a bad for a good; and if he makes any exchange of beast for beast, then both it and that for which it is exchanged shall be holy.
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