II Chronicles 20:1-4, 21-26

It happened after this that the people of Moab with the people of Ammon, and others with them besides the Ammonites, came to battle against Jehoshaphat. Then some came and told Jehoshaphat, saying, “A great multitude is coming against you from beyond the sea, from Syria; and they are in Hazazon Tamar” (which is En Gedi). And Jehoshaphat feared, and set himself to seek the LORD, and proclaimed a fast throughout all Judah. So Judah gathered together to ask help from the LORD; and from all the cities of Judah they came to seek the LORD.

And when he had consulted with the people, he appointed those who should sing to the LORD, and who should praise the beauty of holiness, as they went out before the army and were saying: “Praise the LORD, For His mercy endures forever.” Now when they began to sing and to praise, the LORD set ambushes against the people of Ammon, Moab, and Mount Seir, who had come against Judah; and they were defeated. For the people of Ammon and Moab stood up against the inhabitants of Mount Seir to utterly kill and destroy them. And when they had made an end of the inhabitants of Seir, they helped to destroy one another. So when Judah came to a place overlooking the wilderness, they looked toward the multitude; and there were their dead bodies, fallen on the earth. No one had escaped. When Jehoshaphat and his people came to take away their spoil, they found among them an abundance of valuables on the dead bodies, and precious jewelry, which they stripped off for themselves, more than they could carry away; and they were three days gathering the spoil because there was so much. And on the fourth day they assembled in the Valley of Berachah, for there they blessed the LORD; therefore the name of that place was called The Valley of Berachah until this day.