Leviticus 27:2-4

New Century Version

² “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, ³ 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.) ⁴ The price for a woman twenty to sixty years old is about twelve ounces of silver.