Exodus 16:23, 29

then he said to them, “This is what the LORD meant: Tomorrow is a sabbath observance, a holy sabbath to the LORD. Bake what you will bake and boil what you will boil, and all that is left over put aside to be kept until morning.”

See, the LORD has given you the sabbath; therefore He gives you bread for two days on the sixth day. Remain every man in his place; let no man go out of his place on the seventh day.”