2 Chronicles 20:10-22

10And now, here are the men of Ammon, Moab, and Mount Seir, whom You did not let Israel invade when they came out of the land of Egypt. So Israel turned away from them and did not destroy them. 11See how they are repaying us by coming to drive us out of the possession that You gave us as an inheritance.

12Our God, will You not judge them? For we are powerless before this vast army that comes against us. We do not know what to do, but our eyes are upon You.”

13Meanwhile all the men of Judah, with their wives and children and little ones, were standing before the LORD.

14Then the Spirit of the LORD came upon Jahaziel son of Zechariah, the son of Benaiah, the son of Jeiel, the son of Mattaniah, a Levite from Asaph’s descendants, as he stood in the midst of the assembly. 15And he said, “Listen, all you people of Judah and Jerusalem! Listen, King Jehoshaphat! This is what the LORD says: ‘Do not be afraid or discouraged because of this vast army, for the battle does not belong to you, but to God. 16Tomorrow you are to march down against them. You will see them coming up the Ascent of Ziz, and you will find them at the end of the valley facing the Wilderness of Jeruel. 17You need not fight this battle. Take up your positions, stand firm, and see the salvation of the LORD on your behalf, O Judah and Jerusalem. Do not be afraid or discouraged. Go out and face them tomorrow, for the LORD is with you.’”

18Then Jehoshaphat bowed facedown, and all the people of Judah and Jerusalem fell down before the LORD to worship Him. 19And the Levites from the Kohathites and Korahites stood up to praise the LORD, the God of Israel, shouting in a very loud voice.

20Early in the morning they got up and left for the Wilderness of Tekoa. As they set out, Jehoshaphat stood up and said, “Hear me, O people of Judah and Jerusalem. Believe in the LORD your God, and you will be upheld; believe in His prophets, and you will succeed.”

21Then Jehoshaphat consulted with the people and appointed those who would sing to the LORD and praise the splendor of His holiness. As they went out before the army, they were singing:

22The moment they began their shouts and praises, the LORD set ambushes against the men of Ammon, Moab, and Mount Seir who had come against Judah, and they were defeated.