Romans 4:16-17

Everything depends on having faith in God, so that God's promise is assured by his gift of undeserved grace. This promise isn't only for Abraham's descendants who have the Law. It is for all who are Abraham's descendants because they have faith, just as he did. Abraham is the ancestor of us all. The Scriptures say that Abraham would become the ancestor of many nations. This promise was made to Abraham because he had faith in God, who raises the dead to life and creates new things.