Romans 4:21

NIV: being fully persuaded that God had power to do what he had promised.

NAS: and being fully assured that what God had promised, He was able also to perform.

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

GWT: and was absolutely confident that God would do what he promised.

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

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

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

DRB: Most fully knowing, that whatsoever he has promised, he is able also to perform.

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

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

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