We recommend this book for further reading.
There is such a thing as “the Jewish Sabbath,” or the Sabbath of the Jews, but it is a far different thing from the Sabbath of the Lord. Many people imagine that if one observes the seventh day he is keeping the Jewish Sabbath; but that does not at all follow. There is the same difference between the Jewish Sabbath and the Sabbath of the Lord, that there is between a man and God. The seventh day is “the Sabbath of the Lord.” A man may cease from physical toil on the seventh day of the week, and not keep the Sabbath of the Lord.