Romans 4:11-12

11 aHe received the sign of circumcision as a seal of the righteousness that he had by faith while he was still uncircumcised. The purpose was bto make him the father of all who believe without being circumcised, so that righteousness would be counted to them as well, 12and 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.

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