2 Kings 3:5-9 (KJV)

5 But it came to pass, when Ahab was dead, that the king of Moab rebelled against the king of Israel. 6 And king Jehoram went out of Samaria the same time, and numbered all Israel. 7 And he went and sent to Jehoshaphat the king of Judah, saying, The king of Moab hath rebelled against me: wilt thou go with me against Moab to battle? And he said, I will go up: I am as thou art, my people as thy people, and my horses as thy horses. 8 And he said, Which way shall we go up? And he answered, The way through the wilderness of Edom. 9 So the king of Israel went, and the king of Judah, and the king of Edom: and they fetched a compass of seven days’ journey: and there was no water for the host, and for the cattle that followed them.