This is why the promise is by faith, so that it may be according to grace, to guarantee it to all the descendants— not only to the one who is of the law but also to the one who is of Abraham’s faith. He is the father of us all.
And he received the sign of circumcision as a seal of the righteousness that he had by faith while still uncircumcised. This was to make him the father of all who believe but are not circumcised, so that righteousness may be credited to them also.
You know, then, that those who have faith, these are Abraham’s sons.Now the Scripture saw in advance that God would justify the Gentiles by faith and proclaimed the gospel ahead of time to Abraham, saying, All the nations will be blessed through you.