Exodus 16:23, 29

He told them, “This is what the LORD commanded: Tomorrow will be a day of complete rest, a holy Sabbath day set apart for the LORD. So bake or boil as much as you want today, and set aside what is left for tomorrow.”

They must realize that the Sabbath is the LORD’s gift to you. That is why he gives you a two-day supply on the sixth day, so there will be enough for two days. On the Sabbath day you must each stay in your place. Do not go out to pick up food on the seventh day.”