He hath a devil. They employ the most offensive reproach which they can devise, in slandering Christ, that all may shudder at the thought of hearing him. For wicked men, that they may not be forced to yield to God, in a furious manner, and with closed eyes, break out into proud contempt of him, and excite others to the same rage, so that not a single word of Christ is heard in silence. But the doctrine of Christ has sufficient power in itself to defend it against slanders. And this is what believers mean by their reply,

He hath a devil - John 7:20.
Is mad - Is deranged, or a maniac. His words are incoherent and unintelligible.

He hath a devil, and is mad - So, then, a demoniac and a madman were not exactly the same in the apprehension of the Jews; no more than the effect is the same with the cause which produces it. Some will have it that, when the Jews told our Lord that he had a demon, they meant no more than that he was deranged; but here these matters are evidently distinguished. They believed him to be possessed by a demon, who deranged his faculties, and that he must have been a wicked man, and a deceiver, thus to be put under the power of such a spirit.

And many of them said, he hath a devil, and is mad,.... It was a notion of the Jews, that madness or distraction was from the devil, and therefore these two are here joined together, having a devil, and being mad: there is a spirit which they call Tazazith, and which, they say (z), is an evil spirit that takes away the understanding of men; and under the influence of such a "demon", the Jews thought Christ to be: and therefore say,
why hear ye him? he is a lunatic, he is distracted, he is a madman; how can you bear to hear such ranting blasphemous stuff, which no man in his, senses would ever utter? nor is anything he says to be regarded, since he is not in his right mind; but is under the power and influence of some evil spirit, which instills these wild and frantic notions into him, and puts him upon venting them; but surely no sober man will ever heed to them.
(z) R. David Kimchi, Sepher Shorash rad.