Mark 1:25-27

But Jesus rebuked him: “Silence! Come out of him!” After throwing him into convulsions, the unclean spirit cried out with a loud voice and came out of him. They were all amazed so that they asked each other, “What is this? A new teaching with authority! He even commands the unclean spirits and they obey him.”

Jesus is teaching in the synagogue at Capernaum, and a man (possessed by an unclean spirit) questions why Jesus has come to them. The man asks Jesus if He has come to destroy them, says that he knows who Jesus is, and calls Him "the Holy One of God!". (NIV) Jesus' public and immediate response to this man puts on display authority unlike this crowd has ever experienced. Unclean spirits obey the command of Jesus of Nazareth. Rest and trust in the knowledge that your spiritual battles belong to the Lord.