So the king of Israel and Jehoshaphat the king of Judah went up to Ramothgilead.

Jamieson-Fausset-Brown Bible Commentary

29-38. went up to Ramoth-gilead-The king of Israel, bent on this expedition, marched, accompanied by his ally, with all his forces to the siege; but on approaching the scene of action, his courage failed, and, hoping to evade the force of Micaiah's prophecy by a secret stratagem, he assumed the uniform of a subaltern, while he advised Jehoshaphat to fight in his royal attire. The Syrian king, with a view either to put the speediest end to the war, or perhaps to wipe out the stain of his own humiliation (1Ki 20:31), had given special instructions to his generals to single out Ahab, and to take or kill him, as the author of the war. The officers at first directed their assault on Jehoshaphat, but, becoming aware of their mistake, desisted. Ahab was wounded by a random arrow, which, being probably poisoned, and the state of the weather increasing the virulence of the poison, he died at sunset. The corpse was conveyed to Samaria; and, as the chariot which brought it was being washed, in a pool near the city, from the blood that had profusely oozed from the wound, the dogs, in conformity with Elijah's prophecy, came and licked it [1Ki 21:19]. Ahab was succeeded by his son Ahaziah [1Ki 22:40].

Matthew Henry's Concise Commentary

22:29-40 Ahab basely intended to betray Johoshaphat to danger, that he might secure himself. See what they get that join with wicked men. How can it be expected that he should be true to his friend, who has been false to his God! He had said in compliment to Ahab, I am as thou art, and now he was indeed taken for him. Those that associate with evil-doers, are in danger of sharing in their plagues. By Jehoshaphat's deliverance, God let him know, that though he was displeased with him, yet he had not deserted him. God is a friend that will not fail us when other friends do. Let no man think to hide himself from God's judgment. God directed the arrow to hit Ahab; those cannot escape with life, whom God has doomed to death. Ahab lived long enough to see part of Micaiah's prophecy accomplished. He had time to feel himself die; with what horror must he have thought upon the wickedness he had committed!