But the seventh day is the sabbath of the LORD thy God.... Exodus 20:10
"IT is painful to witness the various inconsistent and self-contradictory positions resorted to by those who reject the Sabbath of the Lord.
But of all the positions adopted, none seem so dangerous, or fraught with such alarming consequences, as the view that the law of God, by which the Sabbath is enforced, has been abolished, and that we are, therefore, under no obligation to remember the Sabbath-day to keep it holy.
The Sabbath of the Lord is embodied in the fourth commandment of the Decalogue.
This commandment stands in the midst of nine moral precepts which Jehovah, after uttering with His own voice, wrote with His own finger on the tables of stone.
---These nine commandments stand around the Sabbath of the Lord, an impregnable bulwark, which all the enemies of that sacred institution in vain at-tempt to destroy.
---It is evident that the Sabbath of the fourth commandment cannot be set aside unless the Decalogue can be destroyed.
Hence the enemies of the Sabbatic institution have brought their 
heaviest artillery to bear upon the law of the Most High: calculating that when they had destroyed this strong hold, the Sabbath would fall an easy prey to their attack. We invite attention then to the law and to the testimony."
J.N. Andrews