SABBATH KEEPERS MUST KEEP THE WHOLE LAW -
The Lord then gave these instructions to Moses: .... “TELL THE PEOPLE OF ISRAEL..... ‘Be careful to keep my Sabbath day, for ........ the Sabbath is a sign of the (OLD) covenant between me and you from generation to generation. It is given so you may know that I am the Lord, who makes you holy. You must keep the Sabbath day, for it is a holy day for you. Anyone who desecrates it must be PUT TO DEATH; anyone who works on that day will be cut off from the community. You have six days each week for your ordinary work, but the seventh day must be a Sabbath day of complete rest, a holy day dedicated to the Lord. Anyone who works on the Sabbath must be PUT TO DEATH. .....THE PEOPLE OF ISRAEL must keep the Sabbath day by observing it from generation to generation......... This is a covenant obligation for all time. ...........It is a permanent sign of my (OLD) covenant with THE PEOPLE OF ISRAEL......... Exodus 31:12-17
For if Joshua had given them rest, God  would not have spoken of another day later on. So then, there remains a Sabbath rest for the people of God, for whoever has entered God’s rest has also rested from his works as God did from his. Hebrews 4:8-10
Jesus said to them, “The Sabbath was made to meet the needs of people, and not people to meet the requirements of the Sabbath. So the Son of Man is Lord, even OVER the Sabbath!”  Mark 2:27,28
Jesus -- He is our Sabbath Rest ! When you enter into Christ Jesus you cease from your works and become His work.  You are at rest !