וּשְׁמַרְתֶּם֙ אֶת־הַשַּׁבָּ֔ת כִּ֛י קֹ֥דֶשׁ הִ֖וא לָכֶ֑ם מְחַֽלְלֶ֙יהָ֙ מ֣וֹת יוּמָ֔ת כִּ֗י כָּל־הָעֹשֶׂ֥ה בָהּ֙ מְלָאכָ֔ה וְנִכְרְתָ֛ה הַנֶּ֥פֶשׁ הַהִ֖וא מִקֶּ֥רֶב עַמֶּֽיהָ׃
Ye shall keep the sabbath therefore, for it is holy unto you; every one that profaneth it shall surely be put to death; for whosoever doeth any work therein, that soul shall be cut off from among his people.
Read halakhic rulings (Jewish law) on Exodus 31:14: and classical halakhic sources.