Romans 4:19-21 CSB

[19] He did not weaken in faith when he considered his own body to be already dead (since he was about a hundred years old) and also the deadness of Sarah's womb. [20] He did not waver in unbelief at God's promise but was strengthened in his faith and gave glory to God, [21] because he was fully convinced that what God had promised, he was also able to do.