Exodus 31:13-14
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The Skilled Craftsmen
13“Now as for you, speak to the sons of Israel, saying, ‘You must keep My Sabbaths; for this is a sign between Me and you throughout your generations, so that you may know that I am the Lord who sanctifies you. 14Therefore you are to keep the Sabbath, for it is holy to you. Everyone who profanes it must be put to death; for whoever does any work on it, that person shall be cut off from among his people.
Exodus 31:13-14 (NASB)