Numbers 18:16 (KJV)
And those that are to be redeemed from a month old shalt thou redeem according to thine estimation for the money of five shekels after the shekel of the sanctuary which is twenty gerahs
And those that are to be redeemed from a month old shalt thou redeem according to thine estimation for the money of five shekels after the shekel of the sanctuary which is twenty gerahs