'Casting Out Demons' in the Bible

"Master," said John, "we saw a man who was casting out demons in your name, and we forbade him, because he was not following us."

"Do you say that I am casting out demons by the power of Beelzebub? If I then am casting out demons by Beelzebub, by whom are your sons casting them out? They therefore shall be your judges.

"But if it is by the finger of God that I am casting out demons, then the kingdom of God is come upon you.