Exodus 34:33 in the King James Version
And till Moses had done speaking with them, he put a vail on his face.
Context
32 Afterward all the children of Israel came near, and he gave them all the commandments that the LORD had spoken with him on Mount Sinai.
33 When Moses was done speaking with them, he put a veil on his face.
34 But when Moses went in before the LORD to speak with him, he took the veil off, until he came out; and he came out, and spoke to the children of Israel that which he was commanded.