Exodus 34:33-35

33When Moses finished speaking to them, he put a veil over his face. 34But whenever he entered the LORD ’s presence to speak with him, he removed the veil until he came out. And when he came out and told the Israelites what he had been commanded, 35they saw that his face was radiant. Then Moses would put the veil back over his face until he went in to speak with the LORD .