2 Chronicles 20:1-3

Now it happened after this that the Moabites and the Ammonites, together with some of the Meunites, came to make war against Jehoshaphat. Then it was reported to Jehoshaphat, “A great multitude has come against you from beyond the [Dead] Sea, out of Aram (Syria); and behold, they are in Hazazon-tamar (that is, Engedi).” Then Jehoshaphat was afraid and set himself [determinedly, as his vital need] to seek the LORD; and he proclaimed a fast throughout all Judah.