2 Chronicles 20:21-24

21When he had consulted with the people, he appointed those who sang to the Lord and those who 1praised Him in holy attire, as they went out before the army and said, “2Give thanks to the Lord, for His faithfulness is everlasting.” 22When they began singing and praising, the Lord 3set ambushes against the sons of 4Ammon, Moab, and Mount Seir, who had come against Judah; so they were struck down. 23For the sons of Ammon and Moab rose up against the inhabitants of Mount Seir, completely destroying them; and when they had finished with the inhabitants of Seir, 5they helped to destroy one another.

24When Judah came to the watchtower of the wilderness, they turned toward the multitude, and behold, they were corpses lying on the ground, and there was no survivor.