Leviticus 27:9-11

Modern English Version

⁹ And if it be an animal, of which men bring an offering to the Lord, all that any man gives of such to the Lord shall be holy. ¹⁰ He shall not exchange it nor substitute it, good for bad or bad for good. If he in fact substitutes an animal for another, then both it and its substitute shall be holy. ¹¹ If it is any sort of unclean animal that is not permitted as an offering to the Lord, then he shall present the animal before the priest.