2 Chronicles 20:21-22

20:21 He met with the people and appointed musicians to play before the Lord and praise his majestic splendor. As they marched ahead of the warriors they said: “Give thanks to the Lord, for his loyal love endures.”

20:22 When they began to shout and praise, the Lord suddenly attacked the Ammonites, Moabites, and men from Mount Seir who were invading Judah, and they were defeated.