1 Kings 22:8

There is yet one man, Micaiah - Elijah, it appears, had withdrawn again after the events of the last chapter, and there was no known prophet of Yahweh within reach of Samaria except Micaiah.

He doth not prophesy good concerning me but evil - Whether the tradition in 1 Kings 20:41 note be true or not, it is certain that Ahab had imprisoned him 1 Kings 22:26, and probable that the imprisonment was on account of threatening prophecies. Ahab suggests to Jehoshaphat that Micaiah is one who allows his private feelings to determine the utterances which he delivers as if from Yahweh. Hence, the force of Jehoshaphat’s answer, “Let not the king say so;” i. e., “Let not the king suppose that a prophet would be guilty of such impiety,” - an impiety from which even Balaam shrank Numbers 22:18.