Leviticus 27:31-33

New Century Version

³¹ If a person wants to get back that tenth, one-fifth must be added to its price.

³² “‘The priest will take every tenth animal from a person’s herd or flock, and it will be holy to the Lord. ³³ The owner should not pick out the good animals from the bad or exchange one animal for another. If that happens, both animals will become holy; they cannot be bought back.’”