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.
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Ambrosiaster
AD 400
Paul says this because Abraham by believing became the forefather of the circumcision, but of the heart, not only of those who descended from him but also of those who, from among the nations, believed in the way he did. He is the father of the Jews according to the flesh, but according to faith he is the father of all believers. Commentary on Paul’s Epistles.
And might be the father of circumcision. The apostle here tells them that Abraham is the father of all true believers, uncircumcised as well as circumcised, and all that believe in Christ, his seed, in whom God promised to bless all nations, are the spiritual sons of Abraham, and partake of the blessings promised to him in his posterity: nor can the circumcised be his true and spiritual children, unless they follow the footsteps of his faith, by which he was justified, when he believed the promises which God made to him before that circumcision was instituted; to wit, that he and Sara should have a son, when they were naturally past the age of having children, and that in his posterity all the world should be blessed, that is, in Christ. (Witham)
Circumcision is meaningless if there is no faith within. It is a sign of righteousness, but if there is no righteousness, then there is no sign either. The reason the Jews received a sign was that they might seek diligently for the reality of which the sign spoke. If they had done so, they would not have needed the sign in the first place. Righteousness is not the only thing that circumcision proclaims; it also proclaims that righteousness can be found in an uncircumcised man (e.g., Abraham). In effect, therefore, circumcision proclaims that there is no need of circumcision.
