Revelation 20:1

Then I saw an angel coming down from heaven, holding the key to the bottomless pit, with a large chain in his hand.

Revelation 1:18

the living one. I was dead but look! I am alive forever and ever! I have the keys of Death and Hades.

Revelation 10:1

Then I saw another powerful angel come down from heaven. He was dressed in a cloud, and there was a rainbow over his head. His face was like the sun, and his legs were like columns of fire.

Luke 8:31

He answered, "Legion," because many demons had gone into him. Then the demons began begging Jesus not to order them to go into the bottomless pit.

2 Peter 2:4

For if God did not spare angels when they sinned, but threw them into the lowest hell and imprisoned them in chains of deepest darkness, holding them for judgment;

Jude 1:6

He has also held in eternal chains those angels who did not keep their own position but abandoned their assigned place. They are held in deepest darkness for judgment on the great day.

Revelation 9:1-2

When the fifth angel blew his trumpet, I saw a star that had fallen to earth from the sky. The star was given the key to the shaft of the bottomless pit.

Revelation 18:1

After these things, I saw another angel coming down from heaven. He had great authority, and the earth was made bright by his splendor.

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 powerful angel come down from heaven. He was dressed in a cloud, and there was a rainbow over his head. His face was like the sun, and his legs were like columns of fire.
Revelation 18:1
After these things, I saw another angel coming down from heaven. He had great authority, and the earth was made bright by his splendor.

Having

Revelation 1:18
the living one. I was dead but look! I am alive forever and ever! I have the keys of Death and Hades.
Revelation 9:1
When the fifth angel blew his trumpet, I saw a star that had fallen to earth from the sky. The star was given the key to the shaft of the bottomless pit.
Luke 8:31
He answered, "Legion," because many demons had gone into him. Then the demons began begging Jesus not to order them to go into the bottomless pit.

A great

2 Peter 2:4
For if God did not spare angels when they sinned, but threw them into the lowest hell and imprisoned them in chains of deepest darkness, holding them for judgment;
Jude 1:6
He has also held in eternal chains those angels who did not keep their own position but abandoned their assigned place. They are held in deepest darkness for judgment on the great day.

General references

Matthew 8:31
So the demons began to plead with Jesus, saying, "If you drive us out, send us into that herd of pigs."
Matthew 12:29
How can someone go into a strong man's house and carry off his possessions without first tying up the strong man? Then he can ransack his house.
Mark 3:27
No one can go into a strong man's house and carry off his possessions without first tying up the strong man. Then he can ransack his house.
Luke 11:22
But when a stronger man than he attacks and defeats him, the stronger man strips off that man's armor in which he trusted and then divides his plunder.

International Standard Version Copyright © 1996-2008 by the ISV Foundation.