2 Chronicles 20:14-21

14Then upon Jahaziel the son of Zechariah, the son of Benaiah, the son of Jeiel, the son of Mattaniah, a Levite of the sons of Asaph, came the Spirit of Yhwh in the midst of the congregation; 15And he said, Hearken ye, all Judah, and ye inhabitants of Jerusalem, and thou king Jehoshaphat, Thus saith Yhwh unto you, Be not afraid nor dismayed by reason of this great multitude; for the battle is not yours, but God’s. 16To morrow go ye down against them: behold, they come up by the cliff of Ziz; and ye shall find them at the end of the brook, before the wilderness of Jeruel.12 17Ye shall not need to fight in this battle: set yourselves, stand ye still, and see the salvation of Yhwh with you, O Judah and Jerusalem: fear not, nor be dismayed; to morrow go out against them: for Yhwh will be with you. 18And Jehoshaphat bowed his head with his face to the ground: and all Judah and the inhabitants of Jerusalem fell before Yhwh, worshipping Yhwh. 19And the Levites, of the children of the Kohathites, and of the children of the Korhites, stood up to praise Yhwh God of Israel with a loud voice on high.

20And 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 ye inhabitants of Jerusalem; Believe in Yhwh your God, so shall ye be established; believe his prophets, so shall ye prosper. 21And when he had consulted with the people, he appointed singers unto Yhwh, and that should praise the beauty of holiness, as they went out before the army, and to say, Praise Yhwh; for his mercy endureth for ever.3