Exodus 16:23, 27-28

And he said unto them, This is that which the LORD hath said, To morrow is the rest of the holy sabbath unto the LORD: bake that which ye will bake to day, and seethe that ye will seethe; and that which remaineth over lay up for you to be kept until the morning.

And it came to pass, that there went out some of the people on the seventh day for to gather, and they found none. And the LORD said unto Moses, How long refuse ye to keep my commandments and my laws?