Whedon's Commentary on the Bible - Matthew 12:4
4 . That Sunday is the “Lord’s day,” is clear from early Christian history; that it is the weekly holy day of the Christian dispensation is clear, because this day is alone mentioned as a sacred day after the resurrection; it is not identical with the overlaid Jewish Sabbaths, for they are abolished. It is, therefore, by necessity identical with the universal creational Sabbath, which is perpetual in its obligations. read more
Whedon's Commentary on the Bible - Matthew 12:3
3 . After the resurrection of Christ the Jewish Sabbath, which was laid upon the primitive Sabbath, was abolished, and “the Lord’s day,” (Revelation 1:10,) or Christian Sabbath, was superimposed upon another day. Thus the Christian Sabbath, being the same as the decalogue Sabbath, or the creation Sabbath, is of perpetual obligation and universal observance. read more