2 Chronicles 20:1-3

And it came to pass after this, that the children of Moab, and the children of Ammon, and with them some of the Ammonites, came against Jehoshaphat to battle. Then there came some that told Jehoshaphat, saying, There cometh a great multitude against thee from beyond the sea from Syria; and, behold, they are in Hazazon-tamar (the same is En-gedi). And Jehoshaphat feared, and set himself to seek unto Jehovah; and he proclaimed a fast throughout all Judah.