Augustine of Hippo
Catena Aurea · Lukasevangelium 11
But he, knowing their thoughts, said unto them, Every kingdom divided against itself is brought to desolation; and a house divided against a house falleth. If Satan also be divided against himself, how shall his kingdom stand? because ye say that I cast out devils through Beelzebub. And if I by Beelzebub cast out devils, by whom do your sons cast them out? therefore shall they be your judges. But if I with the finger of God cast out devils, no doubt the kingdom of God is come upon you.
(de Quæst. Ev. l. ii. qu. 17.) 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.