2. Chronik 20:22

And at the time when they (having come into the neighbourhood of the hostile camp) began with singing and praising, Jahve directed liers in wait against the sons of Ammon, Moab, and Mount Seir, who were come against Judah, and they were smitten. מארבים denotes liers in wait, men hidden in ambush and lying in wait (Jdg 9:25). Who are here meant cannot be ascertained with certainty. Some of the older commentators, Ew. and Berth., think it refers to powers, angels sent by God, who are called insidiatores, because of the work they had to do in the army of the hostile peoples. But the passages where the interposition of heavenly powers is spoken of are different (cf. Kg2 6:17; Kg2 19:35), and it is not probable that heavenly powers would be called מארבים. Most probably earthly liers in wait are meant, who unexpectedly rushed forth from their ambush upon the hostile army, and raised a panic terror among them; so that, as is narrated in Ch2 20:23., the Ammonites and Moabites first turned their weapons against the inhabitants of Mount Seir, and after they had exterminated them, began to exterminate each other. But the ambush cannot have been composed of men of Judah, because they were, according to Ch2 20:15 and Ch2 20:17, not to fight, but only to behold the deliverance wrought by the Lord. Probably it was liers in wait of the Seirites, greedy of spoil, who from an ambush made an attack upon the Ammonites and Moabites, and by the divine leading put the attacked in such fear and confusion, that they turned furiously upon the inhabitants of Mount Seir, who marched with them, and then fell to fighting with each other; just as, in Jdg 7:22., the Midianites were, under divine influence, so terrified by the unexpected attack of the small band led by Gideon, that they turned their sw…

We have here, I. The great danger and distress that Jehoshaphat and his kingdom were in from a foreign invasion (Ch2 20:1, Ch2 20:2). II. The pious course he took for their safety, by fasting, and praying, and seeking God (Ch2 20:3-13). III. The assurance which God, by a prophet, immediately gave them of victory (Ch2 20:14-17). IV. Their thankful believing reception of those assurances (Ch2 20:18-21). V. The defeat which God gave to their enemies thereupon (Ch2 20:22-25). VI. A solemn thanksgiving which they kept for their victory, and for a happy consequences of it (Ch2 20:26-30). VII. The conclusion of the reign of Jehoshaphat, not without some blemishes (Ch2 20:31-37).