Exodus 34:33

31Moses called to them, and Aaron and all the rulers of the congregation returned to him; and Moses spoke to them.

32Afterward all the children of Israel came near, and he gave them all the commandments that the LORD had spoken with him on Mount Sinai.

33When Moses was done speaking with them, he put a veil on his face.

34But when Moses went in before the LORD to speak with him, he took the veil off, until he came out; and he came out, and spoke to the children of Israel that which he was commanded.

35The children of Israel saw Moses’ face, that the skin of Moses’ face shone; so Moses put the veil on his face again, until he went in to speak with him.