Leviticus 27:9-13 - Redemption Of Vowed Animals

⁹ And if it shall be a beast of which men bring an offering to the LORD, all that any man giveth of such to the LORD shall be holy. ¹⁰ He shall not alter it, nor change it, a good for a bad, or a bad for a good: and if he shall at all change beast for beast, then it and the exchange of it shall be holy.

¹¹ And if it shall be any unclean beast, of which they do not offer a sacrifice to the LORD, then he shall present the beast before the priest: ¹² And the priest shall value it, whether it be good or bad: as thou valuest it, who art the priest, so shall it be. ¹³ But if he will at all redeem it, then he shall add a fifth part of it to thy estimation.