Exodus 24:4
4 And Moses kwrote down all the words of the Lord. He rose early in the morning and built an altar at the foot of the mountain, and ltwelve pillars, according to the twelve tribes of Israel.
Exodus 34:28
28 So he was there with the Lord wforty days and forty nights. He neither ate bread nor drank water. And he wrote on the tablets the words of the covenant, the xTen Commandments.1