1 Kings 22:15 - Matthew Poole's English Annotations on the Holy Bible

He answered him; not seriously, but ironically, using the very words of the false prophets, in way of derision; as appears, first, From his omission of that solemn preface, Thus saith the Lord, or, This is the word of the Lord, which the prophets generally used, and which himself useth when he comes to his serious answer, 1 Kings 21:19. Secondly, From Ahab's reply, 1 Kings 21:16, which shows that he suspected Micaiah's sincerity in that answer, and gathered by his gesture or manner of speaking that he spake only mimically, as representing and traducing the false prophets for their answer. See the like ironical passages Genesis 3:22 Judges 10:14 1 Kings 18:27 Ecclesiastes 11:9 Ezekiel 20:39 Amos 4:4,5; all which expressions are not used to lead men into mistakes, but to bring them to the sight of their sin and duty, which may be done sometimes most efficaciously in this way. So Micaiah's meaning is plainly this, Because thou dost not seek to know the truth, but only to please thyself, go to the battle, as all thy prophets advise thee, and expect the success which they promise thee, and try the truth of their prediction by thy own costly experience.