1 Kings 22:15 - Coke's Commentary on the Holy Bible

Go, and prosper: for the Lord shall deliver, &c.— Supposing Micaiah had spoken in earnest, his answer does not at all contradict the other prophets: but the words, it is most likely, were spoken ironically, and in mockery to the equivocal promises which the other prophets made to Ahab. Accordingly, we may observe by Ahab's reply, that he suspected Micaiah's sincerity, and gathered, either from his gesture or manner of speaking, that his meaning was to ridicule and traduce these false prophets for their answers: so that Micaiah's answer is in effect as if he had said, "Since thou dost not seek to know the truth, but only to please thyself, go to the battle, as all thy prophets advise thee; expect the success which they promise thee, and try the truth of their predictions by thy dear-bought experience."