Deuteronomy 9:10

9:10 The Lord gave me the two stone tablets, written by the very finger of God, and on them was everything he said to you at the mountain from the midst of the fire at the time of that assembly.

Exodus 34:28

34:28 So he was there with the Lord forty days and forty nights; he did not eat bread, and he did not drink water. He wrote on the tablets the words of the covenant, the ten commandments.