Luke 11:20:

But if I with the finger of God cast out devils, no doubt the kingdom of God is come upon you.

Notes on Luke 11:20:

I believe that the “finger of God” Jesus mentioned is the Holy Spirit.  When you are baptized with the Holy Spirit, you can minister in the power of the Holy Spirit as Jesus did, and you can cast out demons with the finger of God!

See also:

Healing and the Holy Spirit
Objection: No Gospel of Healing Is Mentioned in the Bible, So It Isn’t Emphasized
Condition: Demon Possession