Leviticus 27:10-12

New Century Version

¹⁰ That person must not try to put another animal in its place or exchange it, a good animal for a bad one, or a bad animal for a good one. If this happens, both animals will become holy.

¹¹ “‘Unclean animals cannot be offered as sacrifices to the Lord, and if someone brings one of them to the Lord, that animal must be brought to the priest. ¹² The priest will decide a price for the animal, according to whether it is good or bad; as the priest decides, that is the price for the animal.