Exodus 16:25-30

Then Moses said, “Eat that today, for today is a Sabbath to the LORD; today you will not find it in the field. Six days you shall gather it, but on the seventh day, the Sabbath, there will be none [in the field].” Now on the seventh day some of the people went out to gather, but they found none. Then the LORD said to Moses, “How long do you [people] refuse to keep My commandments and My instructions (laws)? See, the LORD has given you the Sabbath; therefore He gives you the bread for two days on the sixth day. Let every man stay in his place; no man is to leave his place on the seventh day.” So the people rested on the seventh day.