Romans 4:16-17

Therefore, [inheriting] the promise depends entirely on faith [that is, confident trust in the unseen God], in order that it may be given as an act of grace [His unmerited favor and mercy], so that the promise will be [legally] guaranteed to all the descendants [of Abraham]—not only for those [Jewish believers] who keep the Law, but also for those [Gentile believers] who share the faith of Abraham, who is the [spiritual] father of us all— (as it is written [in Scripture], “I HAVE MADE YOU A FATHER OF MANY NATIONS”) in the sight of Him in whom he believed, that is, God who gives life to the dead and calls into being that which does not exist. [Gen 17:5]