That means that he underwent circumcision as evidence and confirmation of what God had done long before to bring him into this acceptable standing with himself, an act of God he had embraced with his whole life.

¹²And it means further that Abraham is father of all people who embrace what God does for them while they are still on the “outs” with God, as yet unidentified as God’s, in an “uncircumcised” condition. It is precisely these people in this condition who are called “set right by God and with God”! Abraham is also, of course, father of those who have undergone the religious rite of circumcision not just because of the ritual but because they were willing to live in the risky faith-embrace of God’s action for them, the way Abraham lived long before he was marked by circumcision.

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In other versions

ESVEnglish Standard Version

He received the sign of circumcision as a seal of the righteousness that he had by faith while he was still uncircumcised. The purpose was to make him the father of all who believe without being circumcised, so that righteousness would be counted to them as well, and to make him the father of the circumcised who are not merely circumcised but who also walk in the footsteps of the faith that our father Abraham had before he was circumcised.

NIVNew International Version (2011)

And he received circumcision as a sign, a seal of the righteousness that he had by faith while he was still uncircumcised. So then, he is the father of all who believe but have not been circumcised, in order that righteousness might be credited to them. And he is then also the father of the circumcised who not only are circumcised but who also follow in the footsteps of the faith that our father Abraham had before he was circumcised.

CSBChristian Standard Bible

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. And he became the father of the circumcised, who are not only circumcised but who also follow in the footsteps of the faith our father Abraham had while he was still uncircumcised.

NLTNew Living Translation

Circumcision was a sign that Abraham already had faith and that God had already accepted him and declared him to be righteous—even before he was circumcised. So Abraham is the spiritual father of those who have faith but have not been circumcised. They are counted as righteous because of their faith. And Abraham is also the spiritual father of those who have been circumcised, but only if they have the same kind of faith Abraham had before he was circumcised.

LEBThe Lexham English Bible

And he received the sign of circumcision as a seal of the righteousness by faith which he had while uncircumcised, so that he could be the father of all who believe although they are uncircumcised, so that righteousness could be credited to them, and the father of those who are circumcised to those who are not only from the circumcision, but who also follow in the footsteps of the faith of our father Abraham which he had while uncircumcised.

KJV 1900King James Version

And he received the sign of circumcision, a seal of the righteousness of the faith which he had yet being uncircumcised: that he might be the father of all them that believe, though they be not circumcised; that righteousness might be imputed unto them also: 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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