Leviticus 27:9-11

New Revised Standard Version Catholic Edition

⁹ If it concerns an animal that may be brought as an offering to the Lord, any such that may be given to the Lord shall be holy. ¹⁰ Another shall not be exchanged or substituted for it, either good for bad or bad for good; and if one animal is substituted for another, both that one and its substitute shall be holy. ¹¹ If it concerns any unclean animal that may not be brought as an offering to the Lord, the animal shall be presented before the priest.