Lev Leviticus, chapter Book of Leviticus, chapter 27
However, if when you fulfill your promise you are poorer than the fixed value, you are to present the person before the priest, who will then set the value depending on what you can afford.
However, if when you fulfill your promise you are poorer than the fixed value, you are to present the person before the priest, who will then set the value depending on what you can afford.