Leviticus 27:10-12

The Voice

¹⁰ Whoever makes the vow should not switch one animal for another, a good animal for a bad, or vice versa. If someone does switch one for another, then both animals are considered sacred. ¹¹ But if the vow involves an animal that is impure and not acceptable as an offering to Me, he needs to bring the animal before the priest. ¹² The priest will determine its value—either high or low—and whatever he determines will be its price.