And when they began to sing and to praise, the LORD set ambushments against the children of Ammon, Moab, and mount Seir, which were come against Judah; and they were smitten.

And when they began to sing and to praise, Jehovah set liers-in-wait against the children of Ammon, Moab, and mount Seir, that were come against Judah; and they were smitten.

And when they began to sing praises, the Lord turned their ambushments upon themselves, that is to say, of the children of Ammon, and of Moab, and of mount Seir, who were come out to fight against Juda, and they were slain.

And when they began the song of triumph and praise, Jehovah set liers-in-wait against the children of Ammon, Moab, and mount Seir, who had come against Judah, and they were smitten.

And when they began to sing and to praise, the LORD set ambushes against the children of Ammon, Moab, and mount Seir, who were come against Judah; and they were smitten.

And at the time they have begun with singing and praise, Jehovah hath put ambushments against the sons of Ammon, Moab, and mount Seir, who are coming in to Judah, and they are smitten,

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.

And when they had begun to sing praises, the Lord turned their ambushes upon themselves, that is, those of the sons of Ammon, and of Moab, and of mount Seir, who had gone forth so that they might fight against Judah. And they were struck down.

The Lord set ambushments - These liers in wait have been regarded as angels employed by God to confuse the host and cause its destruction, so that the Moabites and Ammonites first united to destroy the Edomites, and then turned upon each other.

The Lord set ambushments - "The Word of the Lord placed snares among the children of Ammon and Moab; and the inhabitants of the mountain of Gibla, who came to fight with Judah; and they were broken to pieces:" so the Targum.
Houbigant translates the place thus: "The Lord set against the children of Ammon and Moab ambushments of those who came from Mount Seir against Judah; and the children of Ammon and Moab were smitten: but they afterwards rose up against the inhabitants of Mount Seir, and utterly destroyed them; who being destroyed, they rose up one against another, and mutually destroyed each other." This is probably the meaning of these verses. Calmet's version is not very different.

And when they began to sing and to praise, the LORD set ambushments against the children of Ammon, Moab, and (o) mount Seir, which were come against Judah; and they were smitten.
(o) Meaning, the Idumeans who dwelt in mount Seir.

And when they began to sing and to praise,.... They sung more or less all the way they went, from the time they set out, but when they came nearer the enemy, they sung louder and louder:
the Lord set ambushments against the children of Ammon, Moab, and Mount Seir, which came against Judah; some take them to be their own ambushments, which they set for the destruction of Judah; but the Lord turned them against their own confederates, mistaking them for Jews; so the Vulgate Latin version,
"the Lord turned their ambushments against themselves;''or rather these were angels, who appeared in the form of the Edomites, and so fell upon the Ammonites and Moabites:
and they were smitten; by them, many of them were destroyed; hence it follows,

THE OVERTHROW OF HIS ENEMIES. (2-Chronicles 20:22-30)
when they began to sing and to praise the Lord set ambushments against the children of Ammon, Moab, and Mount Seir--Some think that this was done by angels in human form, whose sudden appearance diffused an uncontrollable panic. Others entertain the more probable opinion that, in the camp of this vast horde, composed of different tribes, jealousies and animosities had sprung up, which led to widespread dissensions and fierce feuds, in which they drew the sword against each other. The consequence was, that as the mutual strife commenced when the Hebrew procession set out from Jerusalem, the work of destruction was completed before Jehoshaphat and his people arrived at the battlefield. Thus easy is it for God to make the wrath of man to praise Him, to confound the counsels of His enemies and employ their own passions in defeating the machinations they have devised for the overthrow of His Church and people.

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 (Judges 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. 2-Kings 6:17; 2-Kings 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 2-Chronicles 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 2-Chronicles 20:15 and 2-Chronicles 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 Judges 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 swords against and mutually destroyed each other. שׂ בּיושׁבי וּככלּותם, and when they had come to an end (were finished) among the inhabitants of Seir, when they had massacred these, they helped the one against the other to destruction (משׁחית is a substantive, as 2-Chronicles 22:4; Ezekiel 5:16, etc.).

To sing - So acceptable are the fervent prayers of God's people to God, and so terrible to their enemies. Ambushments - Or, liers in wait, either the holy angels, who appeared in the shape of men, and possibly put on the appearances and visages of the Moabites or Ammonites, and in that shape slew the rest, who supposing this slaughter to be done by a part of their own army, fell upon them, and so broke forth into mutual slaughters. Or, God raised jealousies and animosities among themselves, which broke forth, first into secret ambushments, which one party laid for another, and then into open hostilities to their utter destruction. So vain are all mens attempts against God, who needs none to destroy his enemies but themselves, and their own mistakes, and passions, which he can, when he pleaseth, arm against them.