Exodus 31:13-14
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13"Say to the people of Israel, `You shall keep my sabbaths, for this is a sign between me and you throughout your generations, that you may know that I, the LORD, sanctify you. 14You shall keep the sabbath, because it is holy for you; every one who profanes it shall be put to death; whoever does any work on it, that soul shall be cut off from among his people.
Exodus 31:13-14 (RSV)