Romans 4:21

being fully persuaded that God was able to do what He had promised.

Berean Standard Bible
Other translations

King James Version

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

World English Bible

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

American Standard Version

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

Geneva Bible 1599

Being fully assured that he which had promised, was also able to doe it.

Darby Translation

and being fully persuaded that what he has promised he is able also to do;

Young's Literal Translation

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

Bible in Basic English

And being certain that God was able to keep his word.

In context

20Yet he did not waver through disbelief in the promise of God, but was strengthened in his faith and gave glory to God,

22This is why “it was credited to him as righteousness.”

Read Romans 4