Exodus 34:29-33

Now it was so, when Moses came down from Mount Sinai (and the two tablets of the Testimony were in Moses’ hand when he came down from the mountain), that Moses did not know that the skin of his face shone while he talked with Him. So when Aaron and all the children of Israel saw Moses, behold, the skin of his face shone, and they were afraid to come near him. Then Moses called to them, and Aaron and all the rulers of the congregation returned to him; and Moses talked with them. Afterward all the children of Israel came near, and he gave them as commandments all that the LORD had spoken with him on Mount Sinai. And when Moses had finished speaking with them, he put a veil on his face.