Some of the people said, He hath a devil, and is mad; for (as was said before) this was the opinion of the Jews concerning all that were mad and distracted, that it was by the influence of the devil, and they were infested with an evil spirit.
Related Commentaries of John 10:20
John 10:20
20 And many of them said, He hath a devil, and is mad; why hear ye him?