Revelation 20:1

Then I saw an angel coming down from heaven, holding the key of the abyss and a great chain in his hand.

Revelation 1:18

and the living One; and I was dead, and behold, I am alive forevermore, and I have the keys of death and of Hades.

Revelation 10:1

I saw another strong angel coming down out of heaven, clothed with a cloud; and the rainbow was upon his head, and his face was like the sun, and his feet like pillars of fire;

Luke 8:31

They were imploring Him not to command them to go away into the abyss.

2 Peter 2:4

For if God did not spare angels when they sinned, but cast them into hell and committed them to pits of darkness, reserved for judgment;

Jude 1:6

And angels who did not keep their own domain, but abandoned their proper abode, He has kept in eternal bonds under darkness for the judgment of the great day,

Revelation 9:1-2

Then the fifth angel sounded, and I saw a star from heaven which had fallen to the earth; and the key of the bottomless pit was given to him.

Revelation 18:1

After these things I saw another angel coming down from heaven, having great authority, and the earth was illumined 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
I saw another strong angel coming down out of heaven, clothed with a cloud; and the rainbow was upon his head, and his face was like the sun, and his feet like pillars of fire;
Revelation 18:1
After these things I saw another angel coming down from heaven, having great authority, and the earth was illumined with his glory.

Having

Revelation 1:18
and the living One; and I was dead, and behold, I am alive forevermore, and I have the keys of death and of Hades.
Revelation 9:1
Then the fifth angel sounded, and I saw a star from heaven which had fallen to the earth; and the key of the bottomless pit was given to him.
Luke 8:31
They were imploring Him not to command them to go away into the abyss.

A great

2 Peter 2:4
For if God did not spare angels when they sinned, but cast them into hell and committed them to pits of darkness, reserved for judgment;
Jude 1:6
And angels who did not keep their own domain, but abandoned their proper abode, He has kept in eternal bonds under darkness for the judgment of the great day,

General references

Matthew 8:31
The demons began to entreat Him, saying, “If You are going to cast us out, send us into the herd of swine.”
Matthew 12:29
Or how can anyone enter the strong man’s house and carry off his property, unless he first binds the strong man? And then he will plunder his house.
Mark 3:27
But no one can enter the strong man’s house and plunder his property unless he first binds the strong man, and then he will plunder his house.
Luke 11:22
But when someone stronger than he attacks him and overpowers him, he takes away from him all his armor on which he had relied and distributes his plunder.