Speak that which is good This was a most absurd request: for if Micaiah was a true prophet, he could say nothing but what was suggested to him by divine inspiration, and if he were not, why should he speak at all? Of what use could his prophesying be unless to deceive? What the Lord saith unto me, that will I speak What answer the Lord shall put into my mind and mouth. He resolves as became one who had an eye to a greater king than either of these. He seems, as yet, to have had no revelation about the matter. But when the question was put to him, God taught him what to answer.
Related Commentaries of 1 Kings 22:13
1 Kings 22:13-14
13 And the messenger that was gone to call Micaiah spake unto him, saying, Behold now, the words of the prophets declare good unto the king with one mouth: let thy word, I pray thee, be like the word of one of them, and speak that which is good.
14 And Micaiah said, As the LORD liveth, what the LORD saith unto me, that will I speak.