Leviticus 27:10-12

New Living Translation

¹⁰ You may not exchange or substitute it for another animal—neither a good animal for a bad one nor a bad animal for a good one. But if you do exchange one animal for another, then both the original animal and its substitute will be considered holy. ¹¹ If your vow involves an unclean animal—one that is not acceptable as an offering to the Lord—then you must bring the animal to the priest. ¹² He will assess its value, and his assessment will be final, whether high or low.