Romans 4:11–12
11 And he received the sign of circumcisiong as a seal of the righteousness that he had by faith* h while still uncircumcised. This was to make him the fatheri of all who believej but are not circumcised, so that righteousness may be credited to them also. 12 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.