2 Chronicles 20:1-2
1-2Some time later the Moabites and Ammonites, accompanied by Meunites, joined forces to make war on Jehoshaphat. Jehoshaphat received this intelligence report: "A huge force is on its way from beyond the Dead Sea to fight you. There's no time to waste—they're already at Hazazon Tamar, the oasis of En Gedi."
3-4Shaken, Jehoshaphat prayed. He went to God for help and ordered a nationwide fast. The country of Judah united in seeking God's help—they came from all the cities of Judah to pray to God.