Leviticus 27:12

10He shall not alter it, nor exchange it, a good for a bad, or a bad for a good. If he shall at all exchange animal for animal, then both it and that for which it is exchanged shall be holy.

11If it is any unclean animal, of which they do not offer as an offering to the LORD, then he shall set the animal before the priest;

12and the priest shall evaluate it, whether it is good or bad. As the priest evaluates it, so it shall be.

13But if he will indeed redeem it, then he shall add the fifth part of it to its valuation.

14“‘When a man dedicates his house to be holy to the LORD, then the priest shall evaluate it, whether it is good or bad. As the priest evaluates it, so it shall stand.