Romans 4:19-22

19And without becoming weak in faith, he considered his own body—as good as dead, since he was already a hundred years old—and the deadness of Sarah’s womb.

20Yet he did not waver in unbelief concerning the promise of God. Rather, he was strengthened in faith, giving glory to God.

21He was fully convinced that what God has promised, He also is able to do.

22That is why “it was credited to him as righteousness.”