2 Chronicles 20:1-3

After this, the Moabites and Ammonites with some of the Meunites came to wage war against Jehoshaphat. Some people came and told Jehoshaphat, “A vast army is coming against you from Edom, from the other side of the Dead Sea. It is already in Hazezon Tamar” (that is, En Gedi). Alarmed, Jehoshaphat resolved to inquire of the LORD, and he proclaimed a fast for all Judah.