RKJNT(i)
11 And he received the sign of circumcision, a seal of the righteousness which he had by faith while uncircumcised: that he might be the father of all those who believe without being circumcised; that righteousness might be credited to them as well:
12 And the father of the circumcised who are not merely circumcised, but who also walk in the steps of the faith that our father Abraham had while he was yet uncircumcised.
13 For the promise, that he should be the heir of the world, was not given to Abraham, or to his descendants, through the law, but through the righteousness of faith.