Exodus 16:23, 29

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.”

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.”