12 O our God, will you not execute judgment on them? For we are powerless against this great horde that is coming against us. We do not know what to do, but our eyes are on you." 13 Meanwhile all Judah stood before the Lord, with their little ones, their wives, and their children.

14 And 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. 15 And 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. 16 Tomorrow 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. 17 You 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." 18 Then Jehoshaphat bowed his head with his face to the ground, and all Judah and the inhabitants of Jerusalem fell down before the Lord, worshiping the Lord. 19 And the Levites, of the Kohathites and the Korahites, stood up to praise the Lord, the God of Israel, with a very loud voice.

20 And they rose early in the morning and went out into the wilderness of Tekoa. And when they went out, Jehoshaphat stood and said, "Hear me, Judah and inhabitants of Jerusalem! Believe in the Lord your God, and you will be established; believe his prophets, and you will succeed."

Matthew Henry's Commentary on 2 Chronicles 20:12-20

Commentary on 2 Chronicles 20:1-13

(Read 2 Chronicles 20:1-13)

In all dangers, public or personal, our first business should be to seek help from God. Hence the advantage of days for national fasting and prayer. From the first to the last of our seeking the Lord, we must approach him with humiliation for our sins, trusting only in his mercy and power. Jehoshaphat acknowledges the sovereign dominion of the Divine Providence. Lord, exert it on our behalf. Whom should we seek to, whom should we trust to for relief, but the God we have chosen and served. Those that use what they have for God, may comfortably hope he will secure it to them. Every true believer is a son of Abraham, a friend of God; with such the everlasting covenant is established, to such every promise belongs. We are assured of God's love, by his dwelling in human nature in the person of the Saviour. Jehoshaphat mentions the temple, as a token of God's favourable presence. He pleads the injustice of his enemies. We may well appeal to God against those that render us evil for good. Though he had a great army, he said, We have no might without thee; we rely upon thee.

Commentary on 2 Chronicles 20:14-19

(Read 2 Chronicles 20:14-19)

The Spirit of prophecy came upon a Levite in the midst of the congregation. The Spirit, like the wind, blows where and on whom He listeth. He encouraged them to trust in God. Let the Christian soldier go out against his spiritual enemies, and the God of peace will make him more than a conqueror. Our trials will prove our gain. The advantage will be all our own, but the whole glory must be given to God.

Commentary on 2 Chronicles 20:20-30

(Read 2 Chronicles 20:20-30)

Jehoshaphat exhorted his troops to firm faith in God. Faith inspires a man with true courage; nor will any thing help more to the establishing of the heart in shaking times, than a firm belief of the power, and mercy, and promise of God. In all our trust in the Lord, and our praises of him, let us especially look at his everlasting mercy to sinners through Jesus Christ. Never was an army so destroyed as that of the enemy. Thus God often makes wicked people destroy one another. And never was a victory celebrated with more solemn thanksgivings.