Luke 11:18-19

18So Satan would not fight against himself. If he did that, it would be the end of his kingdom. But you say that Beelzebul helps me to destroy bad spirits.

19If that is true, what do you say about your own disciples? They also send bad spirits out of people. You would not say that it is Satan's power that helps them. So your own people show that you are wrong about this.