Mark 1:27KJV
And they were all amazed, insomuch that they questioned among themselves, saying, What thing is this? what new doctrine is this? for with authority commandeth he even the unclean spirits, and they do obey him.
All power was given to Jesus, those who were there were amazed at what Jesus did, today there are people who do not know that Jesus gave you power, so that in the name of Jesus Christ you rebuke the unclean spirits.