Exodus 16:23-30

He said to them, “This is what the LORD has said: ‘Tomorrow is a solemn rest, a holy Sabbath to the LORD’; bake and boil what you will bake and boil [today], and all that remains left over put aside for yourselves to keep until morning.” They put it aside until morning, as Moses told them, and it did not become foul nor was it wormy. 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.