Leviticus 27:2-8

“Speak to the people of Israel and tell them: ‘If someone makes a special promise to give a person as a servant to the LORD by paying a price that is the same value as that person, the price for a man twenty to sixty years old is about one and one-fourth pounds of silver. (You must use the measure as set by the Holy Place.) The price for a woman twenty to sixty years old is about twelve ounces of silver. The price for a man five to twenty years old is about eight ounces of silver; for a woman it is about four ounces of silver. The price for a baby boy one month to five years old is about two ounces of silver; for a baby girl the price is about one and one-half ounces of silver. The price for a man sixty years old or older is about six ounces of silver; for a woman it is about four ounces of silver. “ ‘If anyone is too poor to pay the price, bring him to the priest, and the priest will set the price. The priest will decide how much money the person making the vow can afford to pay.