Wilson's Dictionary of Bible Types
Exodus 8:19 (a) Here is a mark of the power of GOD. Only His finger was needed in order to do great things, and to perform marvelous miracles. We are reminded by this that if so much could be done by one finger, what tremendous things would be done by His whole person.
2 Samuel 21:20 (a) The presence of six fingers and six toes would mark this man as a "superman." Six in the Bible represents the number of man's sufficiency and supremacy.
1 Kings 12:10 (a) The king by means of this figure told the people that the least of his laws of oppression would be worse than the greater laws of oppression which were enforced by his father Solomon. He assured the people that he would be more oppressive and more cruel than his father had been.
Isaiah 58:9 (a) The pointing of the finger was a gesture of impudence and scorn against GOD. This was to be discontinued entirely, and the attitude of Israel was to be completely changed into one of devotion, acceptance and friendliness.
Daniel 5:5 (c) This is a picture to show that GOD uses human instruments to present divine truths. He used only a man's fingers because He did not need man's brains, nor his mind in order to make or reveal His decisions. The man's fingers simply wrote the story that GOD had devised in His own heart.
Luke 11:20 (a) Probably the Lord JESUS was referring to the Holy Spirit as a part of Himself. He said on one occasion that He cast out demons by the Spirit of GOD. It may be also He used the finger to indicate that this was only a very little of His power. When He uses greater power the demons and the Devil himself will be cast into the lake of fire to be forever punished.
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Watson, Walter. Entry for 'Finger'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/f/finger.html. 1957.