For the promise to Abraham and his posterity that he should inherit the world was not through the law but through the righteousness of faith.

For if the subjects of the law are heirs, the faith is done away and the promise abrogated.

Therefore it is by faith that it may be by grace, that the promise may be sure to all the posterity, not to that of the law only but to that of the faith of Abraham, who is a father of us all,

and he did not doubt the promise of God by unbelief, but was strong in faith, giving glory to God,

that is, the children of the flesh are not the children of God, but the children of the promise are accounted the posterity.

For this was the word of promise; According to this time I will come, and Sarah shall have a son.

And this is the promise to them from me, when I take away their sins.