Revelation 18:2

And he cried with a mighty and a loud voice, saying, It is fallen! it is fallen! it is fallen! even Babylon the Great: and it is become the habitation of demons, and the hold of every unclean spirit, and a cage of every unclean and hateful bird:

Treasury of Scripture Knowledge

Summary

As a cage is full of birds, so are their houses full of deceit: therefore they are become great, and waxen rich.

Bible References

Cage

Revelation 18:2
And he cried with a mighty and a loud voice, saying, It is fallen! it is fallen! it is fallen! even Babylon the Great: and it is become the habitation of demons, and the hold of every unclean spirit, and a cage of every unclean and hateful bird: