Exodus 16:4-8

Then the LORD said to Moses, “I will cause food to fall like rain from the sky for all of you. Every day the people must go out and gather what they need for that day. I want to see if the people will do what I teach them. On the sixth day of each week, they are to gather twice as much as they gather on other days. Then they are to prepare it.” So Moses and Aaron said to all the Israelites: “This evening you will know that the LORD is the one who brought you out of Egypt. Tomorrow morning you will see the glory of the LORD, because he has heard you grumble against him. We are nothing, so you are not grumbling against us, but against the LORD.” And Moses said, “Each evening the LORD will give you meat to eat, and every morning he will give you all the bread you want, because he has heard you grumble against him. You are not grumbling against Aaron and me, because we are nothing; you are grumbling against the LORD.”