Exodus 35:1-3

1Moses brought all the Israelites together. Then he said to them, ‘These are the Lord's commands to you.

2You may work for six days each week, but the seventh day will be a holy day for you. It will be a day of complete rest to give honour to the Lord. If anyone works on that day, you must punish him with death.

3Do not light a fire in any of your homes on a Sabbath day.’