John Gill Commentary 2 Chronicles 18:12

"And the messenger that went to call Micaiah spake to him, saying, Behold, the words of the prophets [declare] good to the king with one mouth: let thy word therefore, I pray thee, be like one of theirs, and speak thou good." — 2 Chronicles 18:12 (ASV)

(See Gill on 2 Chronicles 18:2).