Galatians 4:21-23

Tell me, do you want to go back to living strictly by the law? Haven’t you ever listened to what the law really says? Have you forgotten that Abraham had two sons; one by the slave girl, and the other by the freewoman? Ishmael, the son of the slave girl, was born of the natural realm. But Isaac, the son of the freewoman, was born supernaturally by the Spirit—a child of the promise of God!