Exodus 13:3

13:3 Moses said to the people, “Remember this day on which you came out from Egypt, from the place where you were enslaved, for the Lord brought you out of there with a mighty hand – and no bread made with yeast may be eaten.

Exodus 34:34

34:34 But when Moses went in before the Lord to speak with him, he would remove the veil until he came out. Then he would come out and tell the Israelites what he had been commanded.