10 And now, see, the children of Ammon and Moab and the people of Mount Seir, whom you kept Israel from attacking when they came out of Egypt, so that turning to one side they did not send destruction on them: 11 See now, how as our reward they have come to send us out of your land which you have given us as our heritage. 12 O our God, will you not be their judge? for our strength is not equal to this great army which is coming against us; and we are at a loss what to do: but our eyes are on you. 13 And all Judah were waiting before the Lord, with their little ones, their wives, and their children.

14 Then, before all the meeting, the spirit of the Lord came on Jahaziel, the son of Zechariah, son of Benaiah, son of Jeiel, son of Mattaniah, a Levite and one of the family of Asaph; 15 And he said, Give ear, O Judah, and you people of Jerusalem, and you, King Jehoshaphat: the Lord says to you, Have no fear and do not be troubled on account of this great army; for the fight is not yours but God's. 16 Go down against them tomorrow: see, they are coming up by the slope of Ziz; at the end of the valley, before the waste land of Jeruel, you will come face to face with them. 17 There will be no need for you to take up arms in this fight; put yourselves in position, and keep where you are, and you will see the salvation of the Lord with you, O Judah and Jerusalem: have no fear and do not be troubled: go out against them tomorrow, for the Lord is with you. 18 Then Jehoshaphat went down with his face to the earth, and all Judah and the people of Jerusalem gave worship to the Lord, falling down before him. 19 And the Levites, the children of the Kohathites and the Korahites, got to their feet and gave praise to the Lord, the God of Israel, with a loud voice.

20 And early in the morning they got up and went out to the waste land of Tekoa: and when they were going out, Jehoshaphat took his station and said to them, Give ear to me, O Judah and you people of Jerusalem: have faith in the Lord your God and you will be safe; have faith in his prophets and all will go well for you. 21 And after discussion with the people, he put in their places those who were to make melody to the Lord, praising him in holy robes, while they went at the head of the army, and saying, May the Lord be praised, for his mercy is unchanging for ever. 22 And at the first notes of song and praise the Lord sent a surprise attack against the children of Ammon and Moab and the people of Mount Seir, who had come against Judah; and they were overcome. 23 And the children of Ammon and Moab made an attack on the people of Mount Seir with a view to their complete destruction; and when they had put an end to the people of Seir, everyman's hand was turned against his neighbour for his destruction.

Matthew Henry's Commentary on 2 Chronicles 20:10-23

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.