(Exodus 23:12) "Six days shall you do your work": The Sabbath of creation is juxtaposed with shevi'ith (to teach that on shevi'ith — a year of Sabbath) the (observance of the) Sabbath of creation is not superseded.
The Weekly Sabbath Still Applies During the Sabbatical Year
Mekhilta Tractate Kaspa 3:30