Revelation 20:1

Afterwards I saw an angel come down from heaven, having the key of the bottomless pit, with a great chain in his hand.

Revelation 1:18

I am he that liveth; I was dead; but now you see I am alive for all eternity, amen; and I have the keys of the grave, and of death."

Revelation 10:1

Then I saw another mighty angel come down from heaven, invested with a cloud, a rainbow was upon his head, his face was like the sun, and his feet like pillars of fire.

Luke 8:31

and they entreated him not to condemn them to the abyss.

2 Peter 2:4

for since God did not spare the angels, who had sinned, but having precipitated them to hell, confin'd them to chains of darkness, where they are reserv'd for judgment:

Jude 1:6

and the angels which kept not their original dignity, but deserted their proper abode, he hath reserved in everlasting chains under darkness, to the judgment of the great day.

Revelation 9:1-2

And the fifth angel sounded, and I saw a star fall from heaven unto the earth: and to him was given the key of the bottomless pit.

Revelation 18:1

After this I saw another angel come down from heaven, having great power; and the earth was lightned with his glory.

Treasury of Scripture Knowledge

Summary

And I saw an angel come down from heaven, having the key of the bottomless pit and a great chain in his hand.

Bible References

I saw

Revelation 10:1
Then I saw another mighty angel come down from heaven, invested with a cloud, a rainbow was upon his head, his face was like the sun, and his feet like pillars of fire.
Revelation 18:1
After this I saw another angel come down from heaven, having great power; and the earth was lightned with his glory.

Having

Revelation 1:18
I am he that liveth; I was dead; but now you see I am alive for all eternity, amen; and I have the keys of the grave, and of death."
Revelation 9:1
And the fifth angel sounded, and I saw a star fall from heaven unto the earth: and to him was given the key of the bottomless pit.
Luke 8:31
and they entreated him not to condemn them to the abyss.

A great

2 Peter 2:4
for since God did not spare the angels, who had sinned, but having precipitated them to hell, confin'd them to chains of darkness, where they are reserv'd for judgment:
Jude 1:6
and the angels which kept not their original dignity, but deserted their proper abode, he hath reserved in everlasting chains under darkness, to the judgment of the great day.

General references

Matthew 8:31
So the devils entreated him, saying, if you force us out, suffer us to retire into the herd of swine.
Matthew 12:29
besides, how could any one enter into the house of a man of might to rob him of his goods, except he first master the strong man? and then indeed he might plunder his house.
Mark 3:27
no one can enter into a strong man's house, and plunder his goods, unless the man be first secur'd.
Luke 11:22
but if a stronger than he should assault, and overcome him, he will strip him of all his furniture on which he relyed, and divide the plunder.