The Sabbath is not Sunday.

How to keep the Sabbath Day?
http://www.eliyah.com/sabhow2.htm 
Daniel 7:25
²⁵And he shall speak great words against the most High, and shall wear out the saints of the most High, and think to change times and laws: and they shall be given into his hand until a time and times and the dividing of time.



John 14:15
If ye love me, keep my commandments.



Exodus 20:8-11

⁸Remember the sabbath day, to keep it holy.
 ⁹Six days shalt thou labour, and do all thy work:
 ¹⁰But the seventh day is the sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates:
 ¹¹For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it.