Genesis
Romans 4:11
He only got circumcision as a sign or seal of the righteousness which belonged to his faith as an uncircumcised man. The object of this was to make him the father of all who believe as uncircumcised persons and thus have righteousness counted to them,
Romans 4:19-20
His faith never quailed, even when he noted the utter impotence of his own body (for he was about a hundred years old) or the impotence of Sara's womb;
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