Leviticus 27:8
8But if [the one making the vow] is too poor to pay the valuation, he is to present [the person] before the priest [who] shall set the value according to what the one making the vow can afford.
8But if [the one making the vow] is too poor to pay the valuation, he is to present [the person] before the priest [who] shall set the value according to what the one making the vow can afford.