Exodus 34:33-35

And when Moses had finished speaking with them, he put a veil on his face. But whenever Moses went in before the LORD to speak with Him, he would take the veil off until he came out; and he would come out and speak to the children of Israel whatever he had been commanded. And whenever the children of Israel saw the face of Moses, that the skin of Moses’ face shone, then Moses would put the veil on his face again, until he went in to speak with Him.