Exodus 34:27-35

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.” Moses was there with the LORD forty days and forty nights without eating bread or drinking water. And he wrote on the tablets the words of the covenant—the Ten Commandments. When Moses came down from Mount Sinai with the two tablets of the covenant law in his hands, he was not aware that his face was radiant because he had spoken with the LORD. When Aaron and all the Israelites saw Moses, his face was radiant, and they were afraid to come near him. But Moses called to them; so Aaron and all the leaders of the community came back to him, and he spoke to them. Afterward all the Israelites came near him, and he gave them all the commands the LORD had given him on Mount Sinai. When Moses finished speaking to them, he put a veil over his face. But whenever he entered the LORD’s presence to speak with him, he removed the veil until he came out. And when he came out and told the Israelites what he had been commanded, they saw that his face was radiant. Then Moses would put the veil back over his face until he went in to speak with the LORD.