Exodus 34:29-31

And when Moses came down from Mount Sinai, the two tablets of the testimony were in the hand of Moses at his coming down from the mountain; and Moses did not know that the skin of his face shone because of his speaking with him. And Aaron and all the Israelites saw Moses, and, to their amazement, the skin of his face shone, and they were afraid of coming near to him. And Moses called to them, and Aaron and all the leaders of the community returned to him, and Moses spoke to them.