Romans 4:16-18

16Therefore, the promise is based on faith so that it can be a gift. Consequently, the promise is guaranteed for every descendant, not only for those who are descendants by obeying Moses’ Teachings but also for those who are descendants by believing as Abraham did. He is the father of all of us,

17as Scripture says: “I have made you a father of many nations.” Abraham believed when he stood in the presence of the God who gives life to dead people and calls into existence things that don’t even exist.

18When there was nothing left to hope for, Abraham still hoped and believed. As a result, he became a father of many nations, as he had been told: “That is how many descendants you will have.”