Then I saw another strong angel coming down from Heaven. He was robed in a cloud, and over his head was the rainbow. His face was like the sun, and his feet resembled pillars of fire.

After these things I saw another angel coming down from Heaven, armed with great power. The earth shone with his splendor,

Having

I died; but I am now alive until the Ages of the Ages, and I have the keys of the gates of Death and of Hades!

The fifth angel blew his trumpet; and I saw a Star which had fallen from Heaven to the earth; and to him was given the key of the depths of the bottomless pit,

and they besought Him not to command them to be gone into the Bottomless Pit.

A great

For God did not spare angels when they had sinned, but hurling them down to Tartarus consigned them to caves of darkness, keeping them in readiness for judgement.

And angels--those who did not keep the position originally assigned to them, but deserted their own proper abode--He reserves in everlasting bonds, in darkness, in preparation for the judgement of the great day.

General references

So the demons entreated Him. "If Thou drivest us out," they said, "send us into the herd of swine."

Again, how can any one enter the house of a strong man and carry off his goods, unless first of all he masters and secures the strong man: then he will ransack his house.

Nay, no one can go into a strong man's house and carry off his property, unless he first binds the strong man, and then he will plunder his house.

but as soon as another stronger than he attacks him and overcomes him, he takes away that complete armour of his in which he trusted, and distributes the plunder he has collected.