2 Chronicles 20:20-24

Early in the morning they arose and went out into the wilderness of Tekoa. As they went forth, Jehoshaphat stood and said, “Listen to me, O Judah and inhabitants of Jerusalem! Believe in ADONAI your God and you will be confirmed. Trust in His prophets and you will succeed.” After consulting with the people, he appointed singers to ADONAI praising the splendor of His holiness, as they went out before the army saying, “Praise ADONAI, `for His mercy endures forever.” As they began singing and praising, ADONAI set ambushes against the children of Ammon, Moab, and Mount Seir who had come against Judah, and they were defeated. For the Ammonites and Moabites rose up against the inhabitants of Mount Seir to exterminate and annihilate them. When they had exterminated the inhabitants of Seir, they helped to destroy one another. When Judah came to the lookout in the wilderness and looked for the multitude, behold, only corpses were lying on the ground—no one had escaped.