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Make this valley full of ditches - The word נחל nachal may be translated brook, as it is by the Vulgate and Septuagint. There probably was a river here, but it was now dry; and the prophet desires that they would enlarge the channel, and cut out various canals from it, and reservoirs, where water might be collected for the refreshment of the army and of the cattle; and these were to be made so wide that the reflection of the sun's rays from this water might be the means of confounding and destroying the Moabites.

Ditches - Or “pits” Jeremiah 14:3. They were to dig pits in the broad valley or wady, wherein the water might remain, instead of flowing off down the torrent course.

The king of Israel laments their distress, and the danger they were in. He called these kings together, yet he charges it upon Providence. Thus the foolishness of man perverteth his way, and then his heart fretteth against the Lord, Pr 19:3. It was well that Jehoshaphat inquired of the Lord now, but it had been much better if he had done it before he engaged in this war. Good men sometimes neglect their duty, till necessity and affliction drive them to it. Wicked people often fare the better for the friendship and society of the godly. To try their faith and obedience, Elisha bids them make the valley full of pits to receive water. Those who expect God's blessings, must dig pools for the rain to fill, as in the valley of Baca, and thus make even that a well, Ps 84:6. We need not inquire whence the water came. God is not tied to second causes. They that sincerely seek for the dew of God's grace, shall have it, and by it be made more than conquerors.