Romans 4:21 ASV

¹⁹  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;

²⁰  yet, looking unto the promise of God, he wavered not through unbelief, but waxed strong through faith, giving glory to God,

²¹  and being fully assured that what he had promised, he was able also to perform.

²²  Wherefore also it was reckoned unto him for righteousness.

²³  Now it was not written for his sake alone, that it was reckoned unto him;