Exodus 35:1-3

1Moses 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:

2“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.

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