II Chronicles 20:15-21

And he said, “Listen, all you of Judah and you inhabitants of Jerusalem, and you, King Jehoshaphat! Thus says the LORD to you: ‘Do not be afraid nor dismayed because of this great multitude, for the battle is not yours, but God’s. Tomorrow go down against them. They will surely come up by the Ascent of Ziz, and you will find them at the end of the brook before the Wilderness of Jeruel. You will not need to fight in this battle. Position yourselves, stand still and see the salvation of the LORD, who is with you, O Judah and Jerusalem!’ Do not fear or be dismayed; tomorrow go out against them, for the LORD is with you.” And Jehoshaphat bowed his head with his face to the ground, and all Judah and the inhabitants of Jerusalem bowed before the LORD, worshiping the LORD. Then the Levites of the children of the Kohathites and of the children of the Korahites stood up to praise the LORD God of Israel with voices loud and high. So they rose early in the morning and went out into the Wilderness of Tekoa; and as they went out, Jehoshaphat stood and said, “Hear me, O Judah and you inhabitants of Jerusalem: Believe in the LORD your God, and you shall be established; believe His prophets, and you shall prosper.” And when he had consulted with the people, he appointed those who should sing to the LORD, and who should praise the beauty of holiness, as they went out before the army and were saying: “Praise the LORD, For His mercy endures forever.”