The New John Gill Exposition of the Entire BibleMark 3:30
Because they, said, he hath an, unclean spirit.
charged Christ with having a devil, and his miracles with being
wrought by the help of the devil; when, at the same time, they knew
in their own consciences they were works which were wrought by the
finger and Spirit of God, and so were guilty of the sin against the
Holy Ghost; the unpardonable sin, for which there is no remission:
and this is mentioned as a reason why our Lord said what he did
concerning that sin; because they had been guilty of it, and so were
liable to everlasting punishment on account of it.