And immediately there was in their synagogue a man with an unclean spirit. And he cried out, “What have you to do with us, Jesus of Nazareth? Have you come to destroy us? I know who you are—the Holy One of God.” But Jesus rebuked him, saying, “Be silent, and come out of him!” And the unclean spirit, convulsing him and crying out with a loud voice, came out of him. And they were all amazed, so that they questioned among themselves, saying, “What is this? A new teaching with authority! He commands even the unclean spirits, and they obey him.” And at once his fame spread everywhere throughout all the surrounding region of Galilee.

We have seen Jesus power to teach, His power to call people. Now we see His power over evil. He came to earth to destroy the work and evil of the devil and his demons. We begin seeing that here.