Romans 4:21

On the contrary, his faith gave him strength; and he praised God, in the firm conviction that what God has promised he is also able to carry out.

Hebrews 11:19

For he argued that God was able even to raise a man from the dead--and indeed, figuratively speaking, Abraham did receive Isaac back from the dead.

2 Timothy 1:12

That is why I am undergoing these sufferings; yet I feel no shame, for I know in whom I have put my faith, and am convinced 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: "With men this is impossible, but with God everything is possible." Then Peter turned and said to Jesus:

Luke 1:37

For no promise from God shall fail to be fulfilled."

Luke 1:45

Happy indeed is she who believed that the promise which she received from the Lord would be fulfilled."

Romans 8:38

For I am persuaded that neither Death, nor Life, nor Angels, nor Archangels, nor the Present, nor the Future, nor any Powers,

Romans 14:4

Who are you, that you should pass judgment on the servant of another? His standing or falling concerns his own master. And stand he will, for his Master can enable him to stand.

2 Corinthians 9:8

God has power to shower all kinds of blessings upon you, so that, having, under all circumstances and on all occasions, all that you can need, you may be able to shower all kinds of benefits upon others.

Hebrews 11:13

All these died sustained by faith. They did not obtain the promised blessings, but they saw them from a distance and welcomed the sight, and they acknowledged themselves to be only aliens and strangers on the 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 persuaded that neither Death, nor Life, nor Angels, nor Archangels, nor the Present, nor the Future, nor any Powers,
2 Timothy 1:12
That is why I am undergoing these sufferings; yet I feel no shame, for I know in whom I have put my faith, and am convinced that he is able to guard what I have entrusted to him until 'That Day.'
Hebrews 11:13
All these died sustained by faith. They did not obtain the promised blessings, but they saw them from a distance and welcomed the sight, and they acknowledged themselves to be only aliens and strangers on the earth.

He was able

Romans 14:4
Who are you, that you should pass judgment on the servant of another? His standing or falling concerns his own master. And stand he will, for his Master can enable him to stand.
Matthew 19:26
But Jesus looked at them, and said: "With men this is impossible, but with God everything is possible." Then Peter turned and said to Jesus:
Luke 1:37
For no promise from God shall fail to be fulfilled."
2 Corinthians 9:8
God has power to shower all kinds of blessings upon you, so that, having, under all circumstances and on all occasions, all that you can need, you may be able to shower all kinds of benefits upon others.
Hebrews 11:19
For he argued that God was able even to raise a man from the dead--and indeed, figuratively speaking, Abraham did receive Isaac back from the dead.