Numbers 15:32
When the Israelites were in the wilderness they found a man gathering wood on the Sabbath day.
Exodus 35:2-3
In six days work may be done, but on the seventh day there must be a holy day for you, a Sabbath of complete rest to the Lord. Anyone who does work on it will be put to death.
Exodus 16:23
He said to them, "This is what the Lord has said: 'Tomorrow is a time of cessation from work, a holy Sabbath to the Lord. Whatever you want to bake, bake today; whatever you want to boil, boil today; whatever is left put aside for yourselves to be kept until morning.'"
Exodus 16:27-28
On the seventh day some of the people went out to gather it, but they found nothing.
Exodus 20:8-10
"Remember the Sabbath day to set it apart as holy.
Exodus 31:14-15
So you must keep the Sabbath, for it is holy for you. Everyone who defiles it must surely be put to death; indeed, if anyone does any work on it, then that person will be cut off from among his people.