But he turned, and said unto Peter, Get thee behind me, Satan: thou art a stumbling-block unto me: for thou mindest not the things of God, but the things of men.
Christ looked upon Peter with anger and displeasure, Christ heard Satan speaking in Peter. It was Peter's tongue, but Satan tuned it; therefore Christ calls Peter by Satan's name. They that will do the devil's work shall have the devil's name too. He that would hinder the redemption of mankind, is Satan, an adversary to mankind.
Verse 23. Get thee behind me, Satan. The word Satan means, literally, an adversary, or one that opposes us in the accomplishment of our designs. It is applied to the devil commonly, as the opposer or adversary of man. But there is no evidence that the Lord Jesus meant to apply this term to Peter, as signifying that he was Satan or the devil, or...
But he turned, and said--in the hearing of the rest; for Mark (Mar 8:33) expressly says, "When He had turned about and looked on His disciples, He rebuked Peter"; perceiving that he had but boldly uttered what others felt, and that the check was needed by them also.