Exodus 31:13-16

DouayRheims(i) 13 Speak to the children of Israel, and thou shalt say to them: See that you keep my sabbath; because it is a sign between me and you in your generations that you may know that I am the Lord, who sanctify you. 14 keep you my sabbath: for it is holy unto you: he that shall profane it, shall be put to death: he that shall do any work in it, his soul shall perish out of the midst of his people. 15 Six days shall you do work: in the seventh day is the sabbath, the rest holy to the Lord. Every one that shall do any work on this day, shall die. 16 Let the children of Israel keep the sabbath, and celebrate it in their generations. It is an everlasting covenant