Romans 4:18-20

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. And without being weakened in faith he considered his own body now as good as dead (he being about a hundred years old), and the deadness of Sarah’s womb; yet, looking unto the promise of God, he wavered not through unbelief, but waxed strong through faith, giving glory to God