Then they went into Capernaum, a town in Galilee, and Jesus immediately went into the synagogue on the Sabbath and began to teach. The congregation was astonished at what he was teaching them because Jesus was teaching them as an authority, and not merely quoting other people like the scribes did.
There was a man in the synagogue who had an unclean (demonic) spirit. He yelled out “Leave us alone! Why are you bothering us, Jesus the Nazarene? Are you here to destroy us? I know who you are – you are the holy one of God!”
Jesus commanded the demon saying “Be silent, and leave this man!” Immediately the unclean spirit made the man convulse, then it shouted with a loud voice and left him unharmed.
Everyone there was amazed and they began to wonder among themselves “What is this message? He is able to command unclean spirits with authority and they leave!” News about Jesus then began to spread throughout all of Galilee.
MK 1:21-28, LK 4:31-37