Exodus 16:4-6
16:4 Then the Lord said to Moses, “I am going to rain bread from heaven for you, and the people will go out and gather the amount for each day, so that I may test them. Will they will walk in my law or not?
16:5 On the sixth day they will prepare what they bring in, and it will be twice as much as they gather every other day.”
16:6 Moses and Aaron said to all the Israelites, “In the evening you will know that the Lord has brought you out of the land of Egypt,