Exodus 31:13-14
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13"Speak also to the children of Israel, saying, `Most assuredly you shall keep my Sabbaths: for it is a sign between me and you throughout your generations; that you may know that I am Yahweh who sanctifies you. 14You shall keep the Sabbath therefore; for it is holy to you. Everyone who profanes it shall surely be put to death; for whoever does any work therein, that soul shall be cut off from among his people.
Exodus 31:13-14 (WEB)