Revelation 20:1

And I saw an angel coming down out of heaven, having 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 for evermore, and I have the keys of death and of Hades.

Revelation 10:1

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

Luke 8:31

And they entreated him that he would not command them to depart into the abyss.

2 Peter 2:4

For if God spared not angels when they sinned, but cast them down to hell, and committed them to pits of darkness, to be reserved unto judgment;

Jude 1:6

And angels that kept not their own principality, but left their proper habitation, he hath kept in everlasting bonds under darkness unto the judgment of the great day.

Revelation 9:1-2

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

Revelation 18:1

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

Having

Revelation 1:18
and the Living one; and I was dead, and behold, I am alive for evermore, and I have the keys of death and of Hades.
Revelation 9:1
And the fifth angel sounded, and I saw a star from heaven fallen unto the earth: and there was given to him the key of the pit of the abyss.
Luke 8:31
And they entreated him that he would not command them to depart into the abyss.

A great

2 Peter 2:4
For if God spared not angels when they sinned, but cast them down to hell, and committed them to pits of darkness, to be reserved unto judgment;
Jude 1:6
And angels that kept not their own principality, but left their proper habitation, he hath kept in everlasting bonds under darkness unto the judgment of the great day.

General references

Matthew 8:31
And the demons besought him, saying, If thou cast us out, send us away into the herd of swine.
Matthew 12:29
Or how can one enter into the house of the strong man, and spoil his goods, except he first bind the strong man ? and then he will spoil his house.
Mark 3:27
But no one can enter into the house of the strong man , and spoil his goods, except he first bind the strong man ; and then he will spoil his house.
Luke 11:22
but when a stronger than he shall come upon him, and overcome him, he taketh from him his whole armor wherein he trusted, and divideth his spoils.