2 Chronicles 20:1-4

It came to pass after this also, that the children of Moab, and the children of Ammon, and with them other beside 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 on this side Syria; and, behold, they be in Hazazon-tamar, which is Engedi. And Jehoshaphat feared, and set himself to seek the LORD, and proclaimed a fast throughout all Judah. And Judah gathered themselves together, to ask help of the LORD: even out of all the cities of Judah they came to seek the LORD.