Exodus 35:1-3

Moses gathered all the congregation of the sons of Israel together, and said to them, “These are the things which the LORD has commanded you to do: “For six days work may be done, but the seventh day shall be a holy day for you, a Sabbath of complete rest to the LORD; whoever does any kind of work on that day shall be put to death. You shall not kindle a fire in any of your dwellings on the Sabbath day.”