Exodus 34:25-29

“You shall not offer the blood of My sacrifice with leavened bread, nor is the sacrifice of the Feast of the Passover to be left over until morning.

“You shall bring the very first of the first fruits of your soil into the house of the Lord your God. “You shall not boil a young goat in its mother’s milk.”

Then the Lord said to Moses, “Write down these words, for in accordance with these words I have made a covenant with you and with Israel.”

So he was there with the Lord for forty days and forty nights; he did not eat bread or drink water. And He wrote on the tablets the words of the covenant, the Ten Commandments. Moses’ Face Shines

And it came about, when Moses was coming down from Mount Sinai (and the two tablets of the testimony were in Moses’ hand as he was coming down from the mountain), that Moses did not know that the skin of his face shone because of his speaking with Him.