Moabites, Ammonites and some Meunites come to fight Jehoshaphat. He is told that a great multitude is coming from beyond the sea, from Edom, and is already at Hazazon-tamar, that is, En-gedi. Jehoshaphat is afraid, but he resolves to seek the Lord and proclaims a fast throughout Judah. The king stands in the assembly at the temple and prays. He remembers that the Lord rules over all the nations, that he gave the land to Abraham's descendants, and that Israel did not destroy these peoples when it came out of Egypt. Now they repay with evil. Jehoshaphat ends with a confession: we do not know what to do, but our eyes are on you.
The Spirit of the Lord comes on Jahaziel, a Levite descended from Asaph, who announces that they should not fear, because the battle is not theirs but God's. Tomorrow they will go down to meet the enemy, but they will not need to fight: they only have to stand firm and see the Lord's salvation. The people bow down and the Levites praise loudly.
Early in the morning they go out toward the wilderness of Tekoa. Jehoshaphat appoints singers to go before the army praising the Lord for his steadfast love. As they begin to sing, the Lord sets ambushes against the Ammonites, the Moabites and the men of Mount Seir; the Ammonites and Moabites destroy the men of Seir and then kill one another. Judah finds only corpses and spends three days gathering the spoil. On the fourth day they assemble in the Valley of Beracah to bless the Lord, and they return to Jerusalem with joy to the temple. The fear of God falls on the neighboring kingdoms, and Jehoshaphat's realm has peace.
The chapter closes with a summary of Jehoshaphat's reign, which was good though he did not remove the high places, and with a final stain: he allied with Ahaziah king of Israel to build ships, and the prophet Eliezer announced that the Lord would destroy the work.