Exodus 31:12-14

The LORD then gave these instructions to Moses: “Tell the people of Israel: ‘Be careful to keep my Sabbath day, for the Sabbath is a sign of the covenant between me and you from generation to generation. It is given so you may know that I am the LORD, who makes you holy. You must keep the Sabbath day, for it is a holy day for you. Anyone who desecrates it must be put to death; anyone who works on that day will be cut off from the community.