Leviticus 27:10-12

King James Version

¹⁰ He shall not alter it, nor change it, a good for a bad, or a bad for a good: and if he shall at all change beast for beast, then it and the exchange thereof shall be holy.

¹¹ And if it be any unclean beast, of which they do not offer a sacrifice unto the Lord, then he shall present the beast before the priest:

¹² And the priest shall value it, whether it be good or bad: as thou valuest it, who art the priest, so shall it be.