Exodus 16:1-5, 22-26

They set out from Elim, and all the congregation of Israel came to the Wilderness of Sin, which is between Elim and Sinai, on the fifteenth day of the second month after they left the land of Egypt. The whole congregation of the Israelites [grew discontented and] murmured and rebelled against Moses and Aaron in the wilderness, and the Israelites said to them, “Would that we had died by the hand of the LORD in the land of Egypt, when we sat by the pots of meat and ate bread until we were full; for you have brought us out into this wilderness to kill this entire assembly with hunger.” Then the LORD said to Moses, “Behold, I will cause bread to rain from heaven for you; the people shall go out and gather a day’s portion every day, so that I may test them [to determine] whether or not they will walk [obediently] in My instruction (law). And it shall be that on the sixth day, they shall prepare to bring in twice as much as they gather daily [so that they will not need to gather on the seventh day].”

Now on the sixth day they gathered twice as much bread, two omers for each person; and all the leaders of the congregation came and told Moses. 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].”