Charles Ellicott Commentary 2 Chronicles 18:27

"And Micaiah said, If thou return at all in peace, Jehovah hath not spoken by me. And he said, Hear, ye peoples, all of you." — 2 Chronicles 18:27 (ASV)

And Micaiah said. —Literally, as in 1 Kings 22:28.

If you certainly return. —“If you do return.”

And he said — that is, Micaiah said, turning to the crowd of bystanders and making them witnesses to his prediction.

Listen, all you people. —Rather, Listen, O peoples, all of you! Literally, all of them. The book of the prophet Micah opens with these very words (Micah 1:2).

Hitzig thinks they were taken from that passage, and Nöldeke, that they “must be and denote an abbreviation of the entire book.” (!) Thenius, on the other hand, justly argues that the whole section before us bears indubitable marks of historical truth and is probably an extract from the history of Jehoshaphat written by Jehu the son of Hanani (2 Chronicles 20:34).