Leviticus 27:8-12

⁸If anyone who has made such a solemn promise is very poor and unable to pay to free that person from doing what he had promised, he must take that person to the priest. The priest will set the price for freeing him to be what the person who made that solemn promise is able to pay.

⁹If someone solemnly promises to give an animal that is acceptable to be an offering to me, that animal becomes sacred and belongs to me.

¹⁰The person who promised to give it must not give another animal instead of the one that he promised; he must not substitute a bad animal for a good one or even a better one than the one offered. If he would substitute one animal for the other, both animals would belong to me.

¹¹If the animal that he wishes to dedicate to me is a kind that is unacceptable to be an offering to me, he must take that animal to the priest.

¹²The priest will then decide what its value is, according to the animal's good and bad points. Whatever value the priests sets will be the value of the animal, and that is the price that the priest must pay for the animal.