II Chronicles 20:1-3

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.