2 Chronicles 20:21-24

21 When he had taken counsel with the people, he appointed those who should sing to Yahweh, and give praise in holy array, as they went out before the army, and say, Give thanks to Yahweh; for his loving kindness endures forever. 22 When they began to sing and to praise, Yahweh set liers-in-wait against the children of Ammon, Moab, and Mount Seir, who had come against Judah; and they were struck. 23 For the children of Ammon and Moab stood up against the inhabitants of Mount Seir, utterly to kill and destroy them: and when they had made an end of the inhabitants of Seir, everyone helped to destroy another. 24 When Judah came to the watch-tower of the wilderness, they looked at the multitude; and, behold, they were dead bodies fallen to the earth, and there were none who escaped.