Leviticus 27:9-13

9“ ‘If what they vowed is an animal that is acceptable as an offering to the Lord, such an animal given to the Lord becomes holy.

10They must not exchange it or substitute a good one for a bad one, or a bad one for a good one; if they should substitute one animal for another, both it and the substitute become holy.

11If what they vowed is a ceremonially unclean animal—one that is not acceptable as an offering to the Lord—the animal must be presented to the priest,

12who will judge its quality as good or bad. Whatever value the priest then sets, that is what it will be.

13If the owner wishes to redeem the animal, a fifth must be added to its value.