“Before faith came, we were held captive under the law, imprisoned until the coming faith would be revealed.” (Galatians 3: 23) Being under the law, we “were enslaved to the elementary principles of the world.” (Galatians 4: 3)
But,”now that faith has come, we are no longer under a guardian;” (Galatians 3: 25) we are no longer under the law because “God sent His Son, born of woman, born under the law, to redeem those who were under the law, so that we might receive adoption as sons.” (Galatians 4: 4 – 5) As adopted children of God, we are brothers and sisters of Jesus, His only begotten Son.
Therefore, we are not the children of Hagar, but are the children of Sarah.
As such, we are not under law. We live by faith alone.