2 Chronicles 20:18

15 and he said, “Listen, all Judah, and you inhabitants of Jerusalem, and you, King Jehoshaphat. The LORD says to you, ‘Don’t be afraid, and don’t be dismayed because of this great multitude; for the battle is not yours, but God’s.

16 Tomorrow, go down against them. Behold, they are coming up by the ascent of Ziz. You will find them at the end of the valley, before the wilderness of Jeruel.

17 You will not need to fight this battle. Set yourselves, stand still, and see the salvation of the LORD with you, O Judah and Jerusalem. Don’t be afraid, nor be dismayed. Go out against them tomorrow, for the LORD is with you.’”

18 Jehoshaphat bowed his head with his face to the ground; and all Judah and the inhabitants of Jerusalem fell down before the LORD, worshiping the LORD.

19 The Levites, of the children of the Kohathites and of the children of the Korahites, stood up to praise the LORD, the God of Israel, with an exceedingly loud voice.

20 They rose early in the morning and went out into the wilderness of Tekoa. As they went out, Jehoshaphat stood and said, “Listen to me, Judah and you inhabitants of Jerusalem! Believe in the LORD your God, so you will be established! Believe his prophets, so you will prosper.”

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