Albert Barnes Commentary 1 Kings 22:13

"And the messenger that went to call Micaiah spake unto him, saying, Behold now, the words of the prophets [declare] good unto the king with one mouth: let thy word, I pray thee, be like the word of one of them, and speak thou good." — 1 Kings 22:13 (ASV)

And the messenger spoke to him... - There seems to have been a widespread notion among the irreligious and the half-religious of the ancient world that their prophets were not the mere mouthpieces of the god, but that they were persons who had power with the god and could compel, or at least induce, Him to work their will (Isaiah 30:10). They saw that the prophet’s word was accomplished; they did not understand that if he falsified his message, the accomplishment would no longer follow.