Leviticus 27:2-13

2Speak to the children of Israel, and say to them, When a man shall make a difficult vow, the persons shall be for the LORD by thy estimation. 3And thy estimation shall be of the male from twenty years old even to sixty years old, even thy estimation shall be fifty shekels of silver, after the shekel of the sanctuary. 4And if it shall be a female, then thy estimation shall be thirty shekels. 5And if it shall be from five years old even to twenty years old, then thy estimation shall be of the male twenty shekels, and for the female ten shekels. 6And if it shall be from a month old even to five years old, then thy estimation shall be of the male five shekels of silver, and for the female thy estimation shall be three shekels of silver. 7And if it shall be from sixty years old and above; if a male, then thy estimation shall be fifteen shekels, and for the female ten shekels. 8But if he shall be poorer than thy estimation, then he shall present himself before the priest, and the priest shall value him; according to his ability that vowed shall the priest value him. 9And if it shall be a beast, of which men bring an offering to the LORD, all that any man giveth of such to the LORD shall be holy. 10He shall not alter it, nor change it, a good for a bad, or a bad for a good: and if he shall at all change beast for beast, then it and the exchange of it shall be holy. 11And if it shall be any unclean beast, of which they do not offer a sacrifice to the LORD, then he shall present the beast before the priest: 12And the priest shall value it, whether it be good or bad: as thou valuest it, who art the priest, so shall it be.1 13But if he will at all redeem it, then he shall add a fifth part of it to thy estimation.