Romans 4:19-22

19 Without weakening in his belief, he [Abraham] faced the fact that his body was as good as dead -- since he was about one hundred years old -- and that Sarah's womb was also dead.

20 Yet he did not waver through disbelief regarding the promise of the Almighty Ones, but was strengthened in his belief and gave glory to the Amighty Ones,

21 being fully persuaded that the Almighty Ones had power to do what they had promised.

22 This is why "it was credited to him as righteousness."