Revelation 20:1

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

Revelation 1:18

I am the first and the last, who live, though I was dead; and behold, I am alive for ever and ever, Amen, and have the keys of hades and of death.

Revelation 10:1

And I saw another mighty angel coming down from heaven invested with a cloud: and there was a rainbow on his head, and his face was as the sun, and his feet as pillars of fire.

Luke 8:31

And they besought Him that He would not command them to go into the abyss:

2 Peter 2:4

For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgement; and if He spared not the old world,

Jude 1:6

and the angels that kept not their primitive state, but left their proper abode, hath He reserved in everlasting chains, under darkness, to the judgement of the great day:

Revelation 9:1-2

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

Revelation 18:1

And after these things I saw another angel come down from heaven, having great power; and the earth was enlightened 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
And I saw another mighty angel coming down from heaven invested with a cloud: and there was a rainbow on his head, and his face was as the sun, and his feet as pillars of fire.
Revelation 18:1
And after these things I saw another angel come down from heaven, having great power; and the earth was enlightened with his glory.

Having

Revelation 1:18
I am the first and the last, who live, though I was dead; and behold, I am alive for ever and ever, Amen, and have the keys of hades and of death.
Revelation 9:1
And the fifth angel sounded his trumpet, and I saw a star fall from heaven to the earth: and the key of the bottomless pit was given to him.
Luke 8:31
And they besought Him that He would not command them to go into the abyss:

A great

2 Peter 2:4
For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgement; and if He spared not the old world,
Jude 1:6
and the angels that kept not their primitive state, but left their proper abode, hath He reserved in everlasting chains, under darkness, to the judgement of the great day:

General references

Matthew 8:31
saying, If Thou cast us out, permit us to go away into the herd of swine:
Matthew 12:29
Or, how can any one enter into the house of a strong man, and take away his goods, unless he first overpower the strong man? and then indeed he may strip his house.
Mark 3:27
No one can enter into the house of a strong man, and plunder his goods; unless he first bind the strong man, and then he may pillage his house.
Luke 11:22
but when a stronger than he cometh upon him and conquers him, he taketh away his armour, wherein he trusted, and divideth his spoils.