2 Chronicles 20:3–6 (AV)

3 And Jehoshaphat feared, and set himself to seek the LORD, and proclaimed a fast throughout all Judah. 4 And Judah gathered themselves together, to ask help of the LORD: even out of all the cities of Judah they came to seek the LORD. 5 And Jehoshaphat stood in the congregation of Judah and Jerusalem, in the house of the LORD, before the new court, 6 And said, O LORD God of our fathers, art not thou God in heaven? and rulest not thou over all the kingdoms of the heathen? and in thine hand is there not power and might, so that none is able to withstand thee?

2 Chronicles 20:14–17 (AV)

14 Then upon Jahaziel the son of Zechariah, the son of Benaiah, the son of Jeiel, the son of Mattaniah, a Levite of the sons of Asaph, came the Spirit of the LORD in the midst of the congregation; 15 And he said, Hearken ye, all Judah, and ye inhabitants of Jerusalem, and thou king Jehoshaphat, Thus saith the LORD unto you, Be not afraid nor dismayed by reason of this great multitude; for the battle is not yours, but God’s. 16 To morrow go ye down against them: behold, they come up by the cliff of Ziz; and ye shall find them at the end of the brook, before the wilderness of Jeruel. 17 Ye 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; to morrow go out against them: for the LORD will be with you.