He Wrote

Exodus 34:27-28 (ESV Strong's)

27 And the Lord said to Moses, “Write these words, for in accordance with these words I have made a covenant with you and with Israel.” 28 So he was there with the Lord forty days and forty nights. He neither ate bread nor drank water. And he wrote on the tablets the words of the covenant, the Ten Commandments.

The finger of God would first write the Ten Commandments of the covenant on tablets of stone. Moses would throw these down on the ground and break them after finding the Israelites in rebellion. 

Moses would be the hand of the Lord to rewrite the Ten Commandments Of covenant on tablets of stone. 

This might be a foreshadowing of the first and second covenants which find fulfillment in Christ. He is the finger of God manifested as the Son of Man to write the words of God in our hearts.