The people of Yisrael are to keep the Shabbat, to observe Shabbat thru all the generations as a perpetual covenant.
It is a sign between me and the people of Yisrael forever; for in Six days HaShem (Adonai) made heaven and earth, but on the Seventh day HE stopped working and rested.
Then He said to them:
"Shabbat was made for mankind, not mankind for Shabbat. So the Son of Man is Master even of Shabbat."