Exodus 34:27-29

Then the LORD said to Moses, “Write down all these instructions, for they represent the terms of the covenant I am making with you and with Israel.” Moses remained there on the mountain with the LORD forty days and forty nights. In all that time he ate no bread and drank no water. And the LORD wrote the terms of the covenant—the Ten Commandments—on the stone tablets. When Moses came down Mount Sinai carrying the two stone tablets inscribed with the terms of the covenant, he wasn’t aware that his face had become radiant because he had spoken to the LORD.