Micaiah was right because his word was from the Lord. Ahab was killed while faithful Jehoshaphat became king in Judah.
BibleGateway: 1 Kings 22:29-44 ESV Text: 1 Kings 22:29-44 KJV Text: 1Kings 22:29-44 The section starts at about 4:34 and ends at about 7:19 29 So the king of Israel and Jehoshaphat the king of… Micaiah was right because his word was from the Lord. Ahab was killed while faithful Jehoshaphat became king in Judah.