This section contains the battle report of Jehoshaphat against the southeastern Transjordanian coalition of powers, but it was exclusively a sacral war (verse 15: "the battle is not yours, but God's") as the enemies destroyed themselves and the people of Judah only came to sing and pick up the spoils of war. Informed about the invasion of a huge enemy, Jehoshaphat resorted to prayer (verses 6–12), which was also called a 'national lament' (echoing Solomon's prayer in 2 Chronicles 6:28, 34), addressing YHWH as 'O LORD, God of our ancestors' and 'the ruler of all peoples who gave the Israelites their land'. YHWH ordered Israel not to attack these Transjordanian neighbors (Deuteronomy 2), but as they attacked, Jehoshaphat appealed to YHWH for their expulsion from his land.
Jahaziel, a Levitical singer, served as the designated priest to proclaim God's assurance of victory (cf. Deuteronomy 20:2-4; 1 Chronicles 25:1-8), as a result of faith in God, quoting both Moses (Exodus 14:13-14) and David (1 Samuel 7:47). As previous sacral wars, 'the fear of God descends upon all the kingdoms of the countries' (cf. Exodus 15:14-16; Deuteronomy 2:25; 11:25; Joshua 2:9, 11, 24; 10:1-2; 1 Samuel 4:7-8; 14:15; 1 Chronicles 14:7; 2 Chronicles 14:13). Jehoshaphat, all Judeans and the citizens of Jerusalem reacted joyfully by worshipping YHWH (verses 18–19) followed by the Levites, who sang praises to God, even before the salvation happened. The entire action of God (verse 20) took place early in the morning (that is, the time at which God usually acted), leaving no survivor among the enemy armies and the largest spoils in the entire Hebrew Bible (taking three days to collect). The war ended where it began, in the temple of Jerusalem (verses 26–28) and with music (verses 29–30, cf. 17:10; typical for the Chronicles). As fear of YHWH struck not only Judah's neighboring kingdoms, but also all the kingdoms in the region, Judah was in peace as a reward for the nation's exemplary conduct. == The end of Jehoshaphat's reign (20:31–37)==