Revelation 16:14-16 New American Standard Bible (NASB)

14. for they are spirits of demons, performing signs, which go out to the kings of the whole world, to gather them together for the war of the great day of God, the Almighty.

15. ("Behold, I am coming like a thief. Blessed is the one who stays awake and keeps his clothes, so that he will not walk about naked and men will not see his shame.")

16. And they gathered them together to the place which in Hebrew is called Har-Magedon.

Revelation 16