2 Chronicles 20:20-24

20They got up early in the morning and went to the desert of Tekoa. As they were leaving, Jehoshaphat stopped and said, “Listen to me, people of Judah and those living in Jerusalem. Trust the Lord your God, and believe. Believe his prophets, and you will succeed.”

21After he had advised the people, he appointed people to sing to the Lord and praise him for the beauty of his holiness. As they went in front of the troops, they sang, “Thank the Lord because his mercy endures forever!”

22As they started to sing praises, the Lord set ambushes against the Ammonites, Moabites, and the people of Mount Seir who had come into Judah. They were defeated.

23Then the Ammonites and Moabites attacked the people from Mount Seir and annihilated them. After they had finished off the people of Seir, they helped destroy one another.

24The people of Judah went to the watchtower in the desert and looked for the crowd. Corpses were lying on the ground. No one had escaped.