Romans 4
16 Ref For this cause `it is' of faith, that `it may be' according to grace; to the end that the promise may be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham, who is the father of us all
17 Ref (as it is written, A father of many nations have I made thee) before him whom he believed, `even' God, who giveth life to the dead, and calleth the things that are not, as though they were.
18 Ref Who in hope believed against hope, to the end that he might become a father of many nations, according to that which had been spoken, So shall thy seed be.