Mark 1:25

And Jesus rebuked him - A spirit of this cast will only yield to the sovereign power of the Son of God. All watchings, fasting, and mortifications, considered in themselves, will do little or no good. Uncleanness, of every description, will only yield to the rebuke of God.

And Jesus rebuked him - Chided him, or commanded him, with a threatening.

This was not the man that Jesus rebuked, but the spirit, for he instantly commanded the same being to come out of the man. In all this, Jesus did not once address the man. His conversation was with the evil spirit, proving conclusively that it was not a mere disease or mental derangement - for how could the Son of God hold converse with "disease" or "insanity?" - but that he conversed with a "being" who also conversed, reasoned, cavilled, felt, resisted, and knew him. There are, therefore, evil spirits, and those spirits have taken possession of human beings.

Hold thy peace - Greek, "Be muzzled." "Restrain thyself." "Cease from complaints, and come out of the man." This was a very signal proof of the power of Jesus, to be able by a word to silence an evil angel, and, against his will, to compel him to leave a man whom he delighted to torment.