2 Chronicles 20:20-26

And they rose early in the morning, and went forth into the wilderness of Tekoa: and as they went forth, Jehoshaphat stood and said, Hear me, O Judah, and ye inhabitants of Jerusalem; Believe in the LORD your God, so shall ye be established; believe his {m} prophets, so shall ye prosper.

(m) Give credit to their words and doctrine.
And when he had consulted with the people, he appointed singers unto the LORD, and that should praise the beauty of holiness, as they went out before the army, and to say, {n} Praise the LORD; for his mercy [endureth] for ever.

(n) This was a psalm of thanksgiving which they used commonly to sing when they praised the Lord for his benefits, and was made by David, Ps 136:1-26.
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.
For the children of Ammon and Moab stood up against the inhabitants of mount Seir, utterly to slay and destroy [them]: and when they had made an end of the inhabitants of Seir, every one helped to {p} destroy another.

(p) Thus the Lord according to Jehoshaphat's prayer declared his power, when he delivered his by causing their enemies to kill one another.
And on the fourth day they {q} assembled themselves in the valley of Berachah; for there they blessed the LORD: therefore the name of the same place was called, The valley of Berachah, unto this day.

(q) To give thanks to the Lord for the victory: and therefore the valley was called Berachah, that is, blessing or thanksgiving, which was also called the valley of Jehoshaphat, Joel 3:2,12 because the Lord judged the enemies according to Jehoshaphat's prayer.
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