Romans 4:17-19

Common(i) 17 (as it is written, "I have made you the father of many nations") in the presence of the God in whom he believed, who gives life to the dead and calls things that do not exist as though they did. 18 In hope, he believed against hope, so that he became the father of many nations; as he had been told, "So shall your descendants be." 19 And he did not weaken in faith when he considered his own body, which was as good as dead since he was about a hundred years old, or when he considered the barrenness of Sarah's womb.