It should seem from the manner in which the captains received Jehu on his return from the prophet, that they were not much disposed at first to treat the prophet, or his message, with respect. But probably from a divine power accompanying Jehu's account of his anointing him king, and seeing perhaps the traces of the holy oil upon his head, their hearts were wrought upon to cooperate with the Lord's appointment in establishing Jehu to be king.
Related Commentaries of 2 Kings 9:11
2 Kings 9:11-13
11 Then Jehu came forth to the servants of his lord: and one said unto him, Is all well? wherefore came this mad fellow to thee? And he said unto them, Ye know the man, and his communication.
12 And they said, It is false; tell us now. And he said, Thus and thus spake he to me, saying, Thus saith the LORD, I have anointed thee king over Israel.
13 Then they hasted, and took every man his garment, and put it under him on the top of the stairs, and blew with trumpets, saying, Jehu is king.b