2 Chronicles 20:21

When he had taken counsel with the people, he appointed those who were to sing to Yahweh and give praise in holy array as they go out before the army, and say, “Give thanks to Yahweh, for his loving kindness endures forever.”

And when he had consulted with the people, he appointed singers unto 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 endureth for ever.