'Promised' in the Bible

(Which he had promised afore by his prophets in the holy scriptures,)

(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.

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.”

And being fully persuaded that, what he had promised, he was able also to perform.