Romans 4:19-21
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19Without being weakened in faith, he didn`t consider his own body, already having been worn out, (he being about a hundred years old), and the deadness of Sarah`s womb. 20Yet, looking to the promise of God, he wavered not through unbelief, but grew strong through faith, giving glory to God, 21and being fully assured that what he had promised, he was able also to perform.
Romans 4:19-21 (WEB)