Galatians 4:23
His son by the slave woman was born according to the flesh, but his son by the free woman was born because of the promise.

Galatians 3:29
And if you belong to Christ, then you are Abraham's seed and heirs according to the promise.

Acts 3:25
And you are sons of the prophets and of the covenant God made with your fathers, when He said to Abraham, 'Through your offspring all the families of the earth will be blessed.'

Romans 4:13-18
For it was not through the Law that Abraham and his descendants were promised that he would be heir of the world, but through the righteousness that comes by faith. . . .

Romans 9:8, 9
So it is not the children of the flesh who are God's children, but it is the children of the promise who are regarded as offspring. . . .