Revelation 16:14-16

14They are demonic spirits that perform signs, and they go out to the kings of the whole world, to gather them for the battle on the great day of God Almighty.

15“Look, I come like a thief! Blessed is the one who stays awake and remains clothed, so as not to go naked and be shamefully exposed.”

16Then they gathered the kings together to the place that in Hebrew is called Armageddon.