In Romans 4:13, Paul saw the fulfillment of this as follows: “It was not through law that Abraham and his offspring received the promise that he would be heir of the world, but through the righteousness that comes by faith.” As Robert Strimple so aptly puts it, “Where in the Old Testament do you find the promise that Paul refers to here? Nowhere if you insist on a strict literalism. But you find it in Genesis 17:8 . . . if you see that this is inspired apostolic interpretation of the Old Testament promise that Paul is giving us
