2 Kings 3:5-9

But it came to pass, when Ahab was dead, that the king of Moab rebelled against the king of Israel.

And king Jehoram went out of Samaria the same time, and numbered all Israel.

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.

And he said, Which way shall we go up? And he answered, The way through the wilderness of Edom.

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.