Exodus 35:1-3
Sabbath Regulations
35:1 Moses assembled the whole community of the Israelites and said to them, “These are the things that the Lord has commanded you to do.
35:2 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.
35:3 You must not kindle a fire in any of your homes on the Sabbath day.”