Revelation 17:1-5

And one of the seven angels who had the seven vials, came and spoke with me, saying, Come, and I will show you the judgment of the great harlot, that sits upon many waters:

Revelation 18:2-3

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:

Revelation 18:9

And the kings of the earth, who have committed fornication, and lived in luxury with her, shall mourn and lament, when they shall see the smoke of her burning,

Revelation 18:23

and the light of a lamp shall be seen no more in thee; and the voice of the bridegroom, and of the bride, shall be heard no more in thee: because they merchants were the grandees of the earth-because by thy sorceries were all the nations deceived:

Treasury of Scripture Knowledge

Summary

Because of the multitude of the whoredoms of the wellfavoured harlot, the mistress of witchcrafts, that selleth nations through her whoredoms, and families through her witchcrafts.

Bible References

The mistress

Revelation 17:1
And one of the seven angels who had the seven vials, came and spoke with me, saying, Come, and I will show you the judgment of the great harlot, that sits upon many waters:
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: