But he, knowing their thoughts, said unto them,
Every kingdom divided against itself is brought to desolation; and a house divided against a house falls.
All Commentaries on Luke 11:17 Go To Luke 11
Augustine of Hippo
AD 430
That Luke speaks of the finger of God, where Matthew has said, the Spirit, does not take away from their agreement in sense, but it rather teaches us a lesson, that we may know what meaning to give to the finger of God, whenever we read it in the Scriptures.
Now the Holy Spirit is called the finger of God, because of the distribution of gifts which are given through Him, to every one his own gift, whether he be of men or angels. For in none of our members is division more apparent than in our fingers.