Three times each year all the men of Israel must appear before the Sovereign LORD, the God of Israel.
No one will attack and conquer your land when you go to appear before the LORD your God those three times each year. I will drive out the nations that stand in your way and will enlarge your boundaries."
"You must not offer bread made with yeast as a sacrifice to me. And none of the meat of the Passover lamb may be kept over until the following morning.
You must bring the best of the first of each year's crop to the house of the LORD your God. "You must not cook a young goat in its mother's milk."
And the LORD said to Moses, "Write down all these instructions, for they represent the terms of my covenant with you and with Israel."
Moses was up on the mountain with the LORD forty days and forty nights. In all that time he neither ate nor drank. At that time he wrote the terms of the covenant -- the Ten Commandments -- on the stone tablets.
When Moses came down the mountain carrying the stone tablets inscribed with the terms of the covenant, he wasn't aware that his face glowed because he had spoken to the LORD face to face.
References for Exodus 34:29
And when Aaron and the people of Israel saw the radiance of Moses' face, they were afraid to come near him.
But Moses called to them and asked Aaron and the community leaders to come over and talk with him.
Then all the people came, and Moses gave them the instructions the LORD had given him on Mount Sinai.
When Moses had finished speaking with them, he put a veil over his face.