The Greek noun daktylos means a finger. It appears in the New Testament in several significant contexts: the 'finger of God' writing the Ten Commandments (Luke 11:20; cf. Exodus 31:18), Jesus writing in the dust (John 8:6), Thomas touching the wounds of the risen Christ (John 20:27), and the great chasm separating Lazarus and the rich man (Luke 16:24).
The phrase 'finger of God' (daktylos theou) in Luke 11:20 is Jesus' interpretation of His own exorcism ministry — the Kingdom of God is arriving through His actions. This parallels Exodus 8:19 where Pharaoh's magicians, confounded by the plagues, declare 'this is the finger of God.' The resurrection appearance with Thomas (John 20:27) is theologically pivotal: Jesus invites Thomas to touch His wounds — the risen body bears the marks of the cross. The physical daktylos of faith reaches out and touches the wounds that purchased salvation.