Numbers 15:32
One time, while the Israelites were still in the wilderness, a man was found gathering firewood on the Sabbath.
Exodus 35:2-3
You may work for six days. The seventh day is a holy day of worship (a Sabbath). It is a day when you do not work. It is dedicated to Jehovah. Whoever does any work on this day should be put to death.
Exodus 16:23
Moses said: Jehovah has commanded that tomorrow is a holy day of rest, dedicated to God. Bake today what you want to bake and boil what you want to boil. Whatever is left should be put aside and kept for tomorrow.
Exodus 16:27-28
Some of the people went out on the seventh day to gather. They did not find any.
Exodus 20:8-10
Remember the Sabbath day and keep it holy.
Exodus 31:14-15
You are to observe the Sabbath. It is holy to you. Everyone who profanes it will absolutely be put to death. Whoever does any work on it will be removed from his people.