Treasury of Scripture Knowledge
So then they which be of faith are blessed with faithful Abraham.
so then, understand that those who believe are the sons of Abraham.
But you, brothers and sisters, are children of the promise like Isaac.
And he received the sign of circumcision as a seal of the righteousness that he had by faith while he was still uncircumcised, so that he would become the father of all those who believe but have never been circumcised, that they too could have righteousness credited to them.