The prophets doubtless were his own false prophets, or the priests of Baal; probably those very four hundred men whom Jezebel preserved from that great slaughter, 1Ki 18, who yet gave in their answer in the name of Jehovah, not of Baal; either in compliance with Jehoshaphat; or rather, by Ahab's direction, that good Jehoshaphat might be deceived by them into a good opinion of the war.
Related Commentaries of 1 Kings 22:6
1 Kings 22:6
6 Then the king of Israel gathered the prophets together, about four hundred men, and said unto them, Shall I go against Ramothgilead to battle, or shall I forbear? And they said, Go up; for the Lord shall deliver it into the hand of the king.