2 Chronicles 20:20-22

20And they rose early in the morning, and went forth towards the wilderness of Tekoa; and as they went forth, Jehoshaphat stood and said, Hear me, Judah, and ye inhabitants of Jerusalem! Believe in Jehovah your 1God, and ye shall be established; believe his prophets, and ye shall prosper!

21And he consulted with the people, and appointed singers to Jehovah, and those that should praise in holy splendour, as they went forth before the armed men, and say, Give thanks to Jehovah; for his loving-kindness [endureth] for ever!

22And when they began the song of triumph and praise, Jehovah set liers-in-wait against the children of Ammon, Moab, and mount Seir, who had come against Judah, and they were smitten.