Exodus 24:12 (ESV Strong's)
The Lord said to Moses, “Come up to me on the mountain and wait there, that I may give you the tablets of stone, with the law and the commandment, which I have written for their instruction.”
Exodus 31:18 (ESV Strong's)
And he gave to Moses, when he had finished speaking with him on Mount Sinai, the two tablets of the testimony, tablets of stone, written with the finger of God.
John 8:3-7 (ESV Strong's)
3 The scribes and the Pharisees brought a woman who had been caught in adultery, and placing her in the midst 4 they said to him, “Teacher, this woman has been caught in the act of adultery. 5 Now in the Law Moses commanded us to stone such women. So what do you say?” 6 This they said to test him, that they might have some charge to bring against him. Jesus bent down and wrote with his finger on the ground. 7 And as they continued to ask him, he stood up and said to them, “Let him who is without sin among you be the first to throw a stone at her.”
Jesus is the same finger of God that wrote the commandments on tablets of stone and wrote on the ground before the scribes and Pharisees. The new covenant would be written in the earth of the heart of mankind, thus fulfilling the working of the ground begun by Adam in the Garden.
The stone tablets revealed the sin of man. Jesus shows us that no one has a right to condemn another. The stones would drop from their hands and Jesus would continue proclaiming the good news of forgiveness and reconciliation.