Matthew Poole and continuators on 1 Kings 22:15

15 ¶ So he came to the king, and the king said unto him, Micaiah, shall we go against Ramothgilead to battel, or shall we forbear? And he answered him , Go, and prosper: for the LORD shall deliver it into the hand of the king.

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, v. 19. Secondly, From Ahab's reply, ver. 16. which shews that he suspected Micaiah's sincerity in that answer, and gathered by his gesture or manner of speaking, that he spake onely mimically, as representing and traducing the false Prophets for their answer. See the like Ironical passages, Gen. 3. 22. Iudg. 10. 14. 1 King. 18. 27. Eccles. 11. 9. Ezek. 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 onely to please thy self, go to the Battel, 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.