2 Chronicles 20:19-22

19The Levites, from the sons of the Kohathites and of the sons of the Korahites, stood up to praise the Lord God of Israel, with a very loud voice.

20They rose early in the morning and went out to the wilderness of Tekoa; and when they went out, Jehoshaphat stood and said, “Listen to me, O Judah and inhabitants of Jerusalem, 1put your trust in the Lord your God and you will be established. Put your trust in His prophets and succeed.” 21When he had consulted with the people, he appointed those who sang to the Lord and those who 2praised Him in holy attire, as they went out before the army and said, “3Give thanks to the Lord, for His lovingkindness is everlasting.” 22When they began singing and praising, the Lord 4set ambushes against the sons of 5Ammon, Moab and Mount Seir, who had come against Judah; so they were 6routed.