Exodus 34:33-35

And when Moses had done speaking with them, he put a veil on his face. But when Moses went in before Jehovah to speak with him, he took the veil off, until he came out; and he came out, and spake unto the children of Israel that which he was commanded. And the children of Israel saw the face of Moses, that the skin of Moses’ face shone: and Moses put the veil upon his face again, until he went in to speak with him.