Leviticus 27:1-5

Laws About Vows

1The Lord spoke to Moses, saying, 2Speak to the people of Israel and say to them, If anyone amakes a special vow to the Lord involving the valuation of persons, 3then the valuation of a male from twenty years old up to sixty years old shall be fifty shekels
A  shekel was about 2/5 ounce or 11 grams
of silver, according to the cshekel of the sanctuary.
4If the person is a female, the valuation shall be thirty shekels. 5If the person is from five years old up to twenty years old, the valuation shall be for a male twenty shekels, and for a female ten shekels.
Copyright information for ESV