An interesting comment on the Sabbath by Dr. R. Scott Clark of Westminster Seminary California. He’s also a Reformed pastor:
Many Christians today regard the Sabbath as an optional part of the law. They so associate it with the Mosaic law that they assume that when the fading, obsolete, Mosaic covenant was fulfilled that the 4th commandment was annulled. I used to think that. Of course I was wrong because I had not understood yet that the moral law is grounded in the divine nature, which does not change, and that the moral law was first given in creation and that the sabbath pattern was established in creation, not in Moses or the old covenant.
Most of us still are practical nine-commandment Christians, even when we profess adherence to the Sabbath in principle. I’m certainly guilty of this. I do things on the sabbath that are not sabbatical, i.e., which doe not really breathe the spirit of the Sabbath, of resting, worshipping, and anticipating glory. That’s sin and I’m a sinner.
Original quote found here:
I’m quoting this to highlight the fact that there are Christians who worship on Sunday that still affirm the Law of God (10 Commandments). Where we differ is on the day which we view as sacred, but that’s for another post.