Exodus 34:30-34

So when Aaron and all the sons of Israel saw Moses, behold, the skin of his face shone, and they were afraid to approach him.

Then Moses called to them, and Aaron and all the rulers in the congregation returned to him; and Moses spoke to them.

Afterward all the sons of Israel came near, and he commanded them to do everything that the Lord had spoken to him on Mount Sinai.

When Moses had finished speaking with them, he put a veil over his face.

But whenever Moses went in before the Lord to speak with Him, he would take off the veil until he came out; and whenever he came out and spoke to the sons of Israel what he had been commanded,