Exodus 24:12

24:12 The Lord said to Moses, “Come up to me to the mountain and remain there, and I will give you the stone tablets with the law and the commandments that I have written, so that you may teach them.”

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.