Exodus 34:33-35

When Moses finished speaking with them, he put a veil over his face, but when he went into the presence of GOD to speak with him, he removed the veil until he came out. When he came out and told the Israelites what he had been commanded, they would see Moses’ face, its skin glowing, and then he would again put the veil on his face until he went back in to speak with GOD.