2 Chronicles 20:23-24

20:23 The Ammonites and Moabites attacked the men from Mount Seir and annihilated them. When they had finished off the men of Seir, they attacked and destroyed one another. 20:24 When the men of Judah arrived at the observation post overlooking the desert and looked at the huge army, they saw dead bodies on the ground; there were no survivors!