Romans 4:11-12

Living_Oracles(i) 11 And he received the mark of circumcision as a seal of the righteousness of the faith, which he had whilst uncircumcised; that he might be the father of all uncircumcised believers, that righteousness might be counted even to them. 12 And a father to the circumcised, who are not only circumcised, but who also walk in the footsteps of the faith of our father Abraham, which he had whilst in uncircumcision.