Romans 4:12 - Clarke's commentary and critical notes on the Bible

And the father of circumcision to them who are not of the circumcision only, but who also walk in the steps of that faith of our father Abraham, which he had being yet uncircumcised. And the father of circumcision - He is also the head and representative of all the circumcision of all the Jews who walk in the steps of that faith; who seek for justification by faith only, and not by the works of the law; for this was the faith that Abraham had before he received circumcision. For, the covenant being made with Abraham while he was a Gentile, he became the representative of the Gentiles, and they primarily were included in that covenant, and the Jews were brought in only consequentially; but salvation, implying justification by faith, originally belonged to the Gentiles; and, when the Gospel came, they laid hold on this as their original right, having been granted to them by the free mercy of God in their father and representative, Abraham. So that the Jews, to be saved, must come under that Abrahamic covenant, in which the Gentiles are included. This is an unanswerable conclusion, and must, on this point, for ever confound the Jews.