2 Kings 3:8

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

Which way shall we go? ... through the wilderness of Edom. This was a long and circuitous route, by the southern bend of the Dead Sea. Jehoshaphat, however, preferred it, partly because the part of the Moabite territory at which they would arrive was the most defenseless, and partly because he would thereby enlist in the expedition the forces of the king of Edom. But in penetrating the deep, rocky valley of Ahsy, which forms the boundary between Edom and Moab, the confederate armies were reduced, both man and beast, to the greatest extremity for want of water. They were disappointed by finding the wady of this valley, the brook Zered (Deuteronomy 2:13) (Robinson), dry. Jehoram was in despair. But the pious mind of Jehoshaphat inquired for a prophet of the Lord; and, on being informed that Elisha was at hand, 'the three kings went down to him;'

i.e., to his tent, which was either in the camp or close by it. He had been directed there by the Spirit of God for this special purpose. They went to him, not only as a mark of respect, but to supplicate for his assistance, and knowing his stern temper.