Romans 4:13,16-18 NRSVue

13For the promise that he would inherit the world did not come to Abraham or to his descendants through the law but through the righteousness of faith.

16For this reason the promise depends on faith, in order that it may rest on grace, so that it may be guaranteed to all his descendants, not only to the adherents of the law but also to those who share the faith of Abraham (who is the father of all of us, 17as 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 into existence the things that do not exist. 18Hoping against hope, he believed that he would become “the father of many nations,” according to what was said, “So shall your descendants be.”