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
Whedon's Commentary on the Bible - Matthew 12:2
2 . The decalogue, which is of perpetual validity, commands the observance of one day in seven as Sabbath or rest, (for rest is the meaning of the word Sabbath,) but lays down no unchangeable law as to the particular day. read more