Leviticus 27:8-10

Darby Translation

⁸ And if he be poorer than thy valuation, he shall present himself before the priest, and the priest shall value him: according to his means that vowed shall the priest value him.

⁹ And if it be a beast whereof men bring an offering unto Jehovah, all that they give of such unto Jehovah shall be holy.

¹⁰ They shall not alter it nor change it, a good for a bad, or a bad for a good; and if he at all change beast for beast, then it and the exchange thereof shall be holy.