Romans 4:21

in the full assurance that God was able to do what he had promised.

Hebrews 11:19

For he believed that God was able to raise men even from the dead, and from the dead he did indeed, to speak figuratively, receive him back.

2 Timothy 1:12

This is why I am suffering as I am, but I am not ashamed of it, for I know whom I have trusted and I am sure that he is able to guard what I have intrusted to him for that Day.

Matthew 19:26

But Jesus looked at them and said, "For men it is impossible, but anything is possible for God!"

Luke 1:37

For nothing is ever impossible for God."

Luke 1:45

Blessed is she who has believed, For what the Lord has promised her will be fulfilled!"

Romans 8:38

For I am convinced that neither death nor life nor angels nor their hierarchies nor the present nor the future

Romans 14:4

Who are you to criticize someone else's servant? It is for his own master to say whether he succeeds or fails; and he will succeed, for the Master can make him do so.

2 Corinthians 9:8

God is able to provide you with every blessing in abundance so that you will always have enough for every situation, and ample means for every good enterprise:

Hebrews 11:13

All these people lived all their lives in faith, and died without receiving what had been promised; they only saw it far ahead and welcomed the sight of it, recognizing that they themselves were only foreigners and strangers here on earth.

Treasury of Scripture Knowledge

Summary

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

Bible References

Fully

Romans 8:38
For I am convinced that neither death nor life nor angels nor their hierarchies nor the present nor the future
2 Timothy 1:12
This is why I am suffering as I am, but I am not ashamed of it, for I know whom I have trusted and I am sure that he is able to guard what I have intrusted to him for that Day.
Hebrews 11:13
All these people lived all their lives in faith, and died without receiving what had been promised; they only saw it far ahead and welcomed the sight of it, recognizing that they themselves were only foreigners and strangers here on earth.

He was able

Romans 14:4
Who are you to criticize someone else's servant? It is for his own master to say whether he succeeds or fails; and he will succeed, for the Master can make him do so.
Matthew 19:26
But Jesus looked at them and said, "For men it is impossible, but anything is possible for God!"
Luke 1:37
For nothing is ever impossible for God."
2 Corinthians 9:8
God is able to provide you with every blessing in abundance so that you will always have enough for every situation, and ample means for every good enterprise:
Hebrews 11:19
For he believed that God was able to raise men even from the dead, and from the dead he did indeed, to speak figuratively, receive him back.