Exodus 35:1-3

1Moses assembled the whole community of the Israelites and said to them, “These are the things that the Lord has commanded you to do.

2In 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.

3You must not kindle a fire in any of your homes on the Sabbath day.”