Leviticus [Pertaining to Levites] 27:8-12

⁸But if he is poorer than your valuation, then he shall be set before the priest, and the priest shall assign a value to him. The priest shall assign a value according to his ability to pay.

⁹“‘If it is an animal, of which men offer an offering to Adonai , all that any man gives of such to Adonai becomes holy.

¹⁰He 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 animal for animal, then both it and that for which it is changed shall be holy.

¹¹If it is any unclean animal, of which they do not offer as an offering to Adonai , then he shall set the animal before the priest;

¹²and the priest shall value it, whether it is good or bad. As you the priest values it, so shall it be.