2 Chronicles 20:14-17

14And the Spirit of the Lord came upon Jahaziel the son of Zechariah, son of Benaiah, son of Jeiel, son of Mattaniah, a Levite of the sons of Asaph, in the midst of the assembly.

15And he said, "Listen, all Judah and inhabitants of Jerusalem and King Jehoshaphat: Thus says the Lord to you, 'Do not be afraid and do not be dismayed at this great horde, for the battle is not yours but God's.

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

17You will not need to fight in this battle. Stand firm, hold your position, and see the salvation of the Lord on your behalf, O Judah and Jerusalem.' Do not be afraid and do not be dismayed. Tomorrow go out against them, and the Lord will be with you."