Romans 4:13-18

For the promise to Abraham or to his descendants that he would be heir of the world was not through [observing the requirements of] the Law, but through the righteousness of faith. [Gen 17:4-6; 22:16-18] If those who are [followers] of the Law are [the true] heirs [of Abraham], then faith [leading to salvation] is of no effect and void, and the promise [of God] is nullified. For the Law results in [God’s] wrath [against sin], but where there is no law, there is no violation [of it either]. 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] In hope against hope Abraham believed that he would become a father of many nations, as he had been promised [by God]: “SO [numberless] SHALL YOUR DESCENDANTS BE.” [Gen 15:5]