Romans 4:11

and he received circumcision as a sign, a seal of the faith-righteousness which he had while he was in uncircumcision; in order that he might be the father of all who believe, even though they are uncircumcised; so that righteousness might be imputed to them.

Romans 4:19-20

Though he was about a hundred years old, his faith did not fail him when he regarded his own body, now as good as dead. and remembered Sarah's barrenness.

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