John Gill Commentary 2 Kings 9:12

"And they said, It is false; tell us now. And he said, Thus and thus spake he to me, saying, Thus saith Jehovah, I have anointed thee king over Israel." — 2 Kings 9:12 (ASV)

And they said, [it is] false, tell us now

They did not believe he spoke truth, but concealed from them the real matter; which they concluded to be of some importance, by the hastiness of the messenger, the privacy between them, the countenance of Jehu, which discovered thoughtfulness and concern, and the trifling answer he sought to put them off with; all which increased their curiosity, and made them urgent and importunate to know the truth of the matter: and he said,

thus and thus spoke he to me ;

such and such words as above: and particularly saying, thus says the Lord, I have anointed you king over Israel ;

and no doubt told them that he poured oil on his head, and anointed him, and he might show them the oil.