'Madman' in the Bible

And Jehu hath gone out unto the servants of his lord, and one saith to him, 'Is there peace? wherefore came this madman unto thee?' and he saith unto them, 'Ye have known the man and his talk.'

Again the watchman reported, “He reached them but hasn’t started back. Also, the driving is like that of Jehu son of Nimshi—he drives like a madman.”