C. F. Keil and Franz Delitzsch on 1 Kings 22:29-40

1Ki 22:29-40 The issue of the war, and death of Ahab. - 1Ki 22:29. Ahab, disregarding Micah’s prophecy, went on with the expedition, and was even joined by Jehoshaphat, of whom we should have thought that, after what had occurred, he at any rate would have drawn back. He was probably deterred by false shame, however, from retracting the unconditional promise of help which he had given to Ahab, merely in consequence of a prophetic utterance, which Ahab had brought against his own person from Micah’s subjective dislike. But Jehoshaphat narrowly escaped paying the penalty for it with his life (v. 32), and on his fortunate return to Jerusalem had to listen to a severe reproof from the prophet Jehu in consequence (2Ch 19:2).