2 Chronicles 20:15-17

He said, “Listen carefully, all [you people of] Judah, and you inhabitants of Jerusalem, and King Jehoshaphat. The LORD says this to you: ‘Be not afraid or dismayed at this great multitude, for the battle is not yours, but God’s. Go down against them tomorrow. Behold, they will come up by the ascent of Ziz, and you will find them at the end of the river valley, in front of the Wilderness of Jeruel. You need not fight in this battle; take your positions, stand and witness 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.’ ”