Exodus 16:27-30

27Yet on the seventh day some of the people went out to gather, but they did not find any.

28Then the Lord said to Moses, “How long will you refuse to keep my commands and instructions?

29Understand that the Lord has given you the Sabbath; therefore on the sixth day he will give you two days’ worth of bread. Each of you stay where you are; no one is to leave his place on the seventh day.”

30So the people rested on the seventh day.