1 Kings 22:12

22:12 All the prophets were prophesying the same, saying, “Attack Ramoth Gilead! You will succeed; the Lord will hand it over to the king.”

1 Kings 22:15

22:15 When he came before the king, the king asked him, “Micaiah, should we attack Ramoth Gilead or not?” He answered him, “Attack! You will succeed; the Lord will hand it over to the king.” ¹ 

[22:15]  ¹ sn “Attack! You will succeed; the Lord will hand it over to the king.” One does not expect Micaiah, having just vowed to speak only what the Lord tells him, to agree with the other prophets and give the king an inaccurate prophecy. Micaiah’s actions became understandable later, when it is revealed that the Lord desires to deceive the king and lead him to his demise. The Lord even dispatches a lying spirit to deceive Ahab’s prophets. Micaiah can lie to the king because he realizes this lie is from the Lord. It is important to note that in v. 14 Micaiah only vows to speak the word of the Lord; he does not necessarily say he will tell the truth. In this case the Lord’s word itself is deceptive. Only when the king adjures him to tell the truth (v. 16), does Micaiah do so.