Romans 4:21

in full assurance that He was able to do what He had promised.

Hebrews 11:19

For he considered the fact that God was able to raise people from the dead; and so from the dead, in a figure, he did receive him back.

2 Timothy 1:12

This is why I am suffering so, but I am not ashamed of it, for I know whom I have trusted and I am absolutely sure that He is able to guard what I have entrusted to Him until that day.

Matthew 19:26

But Jesus looked at them and said, "This is impossible for men, 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 is promised to her by the Lord will be fulfilled."

Romans 8:38

For I have full assurance that neither death nor life nor angels nor principalities nor the present nor the future

Romans 14:4

Who are you to criticize another man's servant? It is his own master's business whether he stands or falls, and he will stand, for the Lord has power to make him stand.

2 Corinthians 9:8

And God is able to make your every spiritual blessing overflow for you, so that you will always have in every situation an entire sufficiency and so overflow for every good cause;

Hebrews 11:13

These people all died victoriously as a result of their faith, although they did not receive the blessings promised; that is, because they really saw them in the far-off future and welcomed them, and so professed to be 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 have full assurance that neither death nor life nor angels nor principalities nor the present nor the future
2 Timothy 1:12
This is why I am suffering so, but I am not ashamed of it, for I know whom I have trusted and I am absolutely sure that He is able to guard what I have entrusted to Him until that day.
Hebrews 11:13
These people all died victoriously as a result of their faith, although they did not receive the blessings promised; that is, because they really saw them in the far-off future and welcomed them, and so professed to be only foreigners and strangers here on earth.

He was able

Romans 14:4
Who are you to criticize another man's servant? It is his own master's business whether he stands or falls, and he will stand, for the Lord has power to make him stand.
Matthew 19:26
But Jesus looked at them and said, "This is impossible for men, but anything is possible for God."
Luke 1:37
For nothing is ever impossible for God."
2 Corinthians 9:8
And God is able to make your every spiritual blessing overflow for you, so that you will always have in every situation an entire sufficiency and so overflow for every good cause;
Hebrews 11:19
For he considered the fact that God was able to raise people from the dead; and so from the dead, in a figure, he did receive him back.