Exodus 34:32-35

32Afterward all Bnei-Yisrael came near, and he gave them all the mitzvot that Adonai had spoken to him in Mount Sinai.

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

34But when Moses went before Adonai, so that He could speak with him, he took the veil off until he came out. When he came out and spoke to Bnei-Yisrael what he was commanded,

35Bnei-Yisrael saw the face of Moses and that the skin of his face glistened. So Moses put the veil back over his face until he went in to speak with Him.