The earlier poster was correct. The Sabbath was a foreshadowing of the "Sabbath" who was go come -- Jesus Christ. In Christ the believer finds the "Sabbath rest," which is eternal and perpetual, and not confined to one day of the week.
Read on, there is at least one other freeper who agrees that Sunday is the Christian Sabbath--even if what you posted holds, there still is one day set apart from the others in the week (hence the traditional day off on Sunday--and later Saturday). Furthermore, there are at least two additional others who have heard of Sunday being referred to as the Christian Sabbath.