Leviticus 27:8-10

Holman Christian Standard Bible

⁸ But if one is too poor to pay the assessment, he must present the person before the priest and the priest will set a value for him. The priest will set a value for him according to what the one making the vow can afford.

⁹ “If the vow involves one of the animals that may be brought as an offering to the Lord, any of these he gives to the Lord will be holy. ¹⁰ He may not replace it or make a substitution for it, either good for bad, or bad for good.^(A) But if he does substitute one animal for another, both that animal and its substitute will be holy.