Romans 4:19-21

King James Version

¹⁹ And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sarah's womb:

²⁰ He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God;

²¹ And being fully persuaded that, what he had promised, he was able also to perform.