5 But after Ahab's death, the king of Moab rebelled against the king of Israel.

6 So King Joram promptly mustered the army of Israel and marched from Samaria. 7 On the way, he sent this message to King Jehoshaphat of Judah: "The king of Moab has rebelled against me. Will you join me in battle against him?" And Jehoshaphat replied, "Why, of course! You and I are as one. My troops are your troops, and my horses are your horses."

Matthew Henry's Commentary on 2 Kings 3:5-7

Commentary on 2 Kings 3:1-5

(Read 2 Kings 3:1-5)

Jehoram took warning by God's judgment, and put away the image of Baal, yet he maintained the worship of the calves. Those do not truly repent or reform, who only part with the sins they lose by, but continue to love the sins that they think to gain by.

Commentary on 2 Kings 3:6-19

(Read 2 Kings 3:6-19)

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, Psalm 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.