Romans 4:18-22

18Against all hope, Abraham in hope believed and so became the father of many nations, just as he had been told, “So shall your offspring be.”1 19Without weakening in his faith, he acknowledged the decrepitness of his body (since he was about a hundred years old) and the lifelessness of Sarah’s womb. 20Yet he did not waver through disbelief in the promise of God, but was strengthened in his faith and gave glory to God, 21being fully persuaded that God was able to do what He had promised. 22This is why “it was credited to him as righteousness.”2