Luke 4:34-35

"Ha!" translates an expression of "indignant surprise." [Note: J. M. Creed, The Gospel According to St. Luke. A Commentary on the Third Gospel, p. 30.] "What do we have to do with you" means something like, "Why this interference?" [Note: Danker, p. 61.] The demon testified to Jesus’ messianic and divine character. He was the "Holy One of God" in contrast to the unclean demon. Jesus may have silenced the demon to prevent a premature movement to recognize Him as simply a political Messiah. Again Jesus’ authority is obvious in His command to keep quiet. Jesus also expelled the demon on His own authority, not by invoking the name of some other power. Luke, who consistently showed interest in people’s physical conditions, noted that even though the demon exited violently he did not hurt the man. Jesus effected the release of one whom Satan had held captive, and He did it completely (Luke 4:18).