Romans 4
17 Ref As it is written, "I have made you a father of many nations." This is in the presence of him whom he believed: God, who gives life to the dead, and calls 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 will your seed be."
19 Ref Without being weakened in faith, he didn't consider his own body, already having been worn out, (he being about a hundred years old), and the deadness of Sarah's womb.
20 Ref Yet, looking to the promise of God, he didn't waver through unbelief, but grew strong through faith, giving glory to God,