2 Chronicles 20:19-21

AKJV(i) 19 And the Levites, of the children of the Kohathites, and of the children of the Korhites, stood up to praise the LORD God of Israel with a loud voice on high. 20 And they rose early in the morning, and went forth into the wilderness of Tekoa: and as they went forth, Jehoshaphat stood and said, Hear me, O Judah, and you inhabitants of Jerusalem; Believe in the LORD your God, so shall you be established; believe his prophets, so shall you prosper. 21 And when he had consulted with the people, he appointed singers to the LORD, and that should praise the beauty of holiness, as they went out before the army, and to say, Praise the LORD; for his mercy endures for ever.