2 Chronicles 20:23-24

23And the children of Ammon and Moab stood up against the inhabitants of mount Seir, to exterminate and destroy [them]; and when they had made an end of the inhabitants of Seir, they helped to destroy one another.

24And Judah came on to the mountain-watch in the wilderness, and they looked toward the multitude; and behold, they were dead bodies fallen to the earth, and none had escaped.