Romans 4:19-21

Young's Literal Translation

¹⁹ and not having been weak in the faith, he did not consider his own body, already become dead, (being about a hundred years old,) and the deadness of Sarah's womb,

²⁰ and at the promise of God did not stagger in unbelief, but was strengthened in faith, having given glory to God,

²¹ and having been fully persuaded that what He hath promised He is able also to do: