2 Chronicles 20:14-17

14Then upon Jahaziel the son of Zechariah, the son of Benaiah, the son of Jeiel, the son of Mattaniah, the Levite, of the sons of Asaph, came the spirit of the LORD in the midst of the congregation;

15and he said, Hearken ye, all Judah, and ye inhabitants of Jerusalem, and thou king Jehoshaphat: thus saith the LORD unto you, Fear not ye, neither be dismayed by reason of this great multitude; for the battle is not yours, but God’s.

16Tomorrow go ye down against them: behold, they come up by the ascent of Ziz; and ye shall find them at the end of the valley, before the wilderness of Jeruel.

17Ye shall not need to fight in this battle: set yourselves, stand ye still, and see the salvation of the LORD with you, O Judah and Jerusalem: fear not, nor be dismayed: tomorrow go out against them; for the LORD is with you.