In this parsha, Moshe is transmitting to the Jewish people the precepts of the Mishkan, the Tabernacle, which God gave him on Mount Sinai. But if you look closely, there are differences between God’s command and Moshe’s transmission. For instance, when God commands Moshe not to build the Mishkan on Shabbat, he says: “Six days you shall do labor, and on the seventh day shall be Shabbat…” But in our parsha, when Moshe relays it to the Jewish people, he says: “Six days’ labor shall be done, but on the seventh day is a sanctified Shabbat…”

Rabbi Naftali Tzvi Yehudah Berlin addresses this difference and explains that although one may begin work before Shabbat that will continue on its own—such as placing grain in a windmill on Erev Shabbat—the phrase “Six days’ labor shall be done, but on the seventh day is a sanctified Shabbat” teaches us that Moshe is saying, with regard to the Tabernacle, not only should you not build it on Shabbat, but no work at all, even permitted work, may be done to build the Tabernacle on Shabbat. The Tabernacle is so holy that even though technically it is permitted to allow work begun before Shabbat to continue on its own, to build the Mishkan—even automatically on Shabbat—would be forbidden.

But why should the building of the Tabernacle, which is a mitzvah, be stricter regarding labor on Shabbat than Shabbat itself? It should be the opposite. It seems the building of the Mishkan needs Shabbat even more than we do; the limits of Shabbat loom larger in the context of the Mishkan than in our regular Shabbat lives. The Mishkan is not just, as Rambam says, a way of weaning the Jews off the idolatry they learned in Egypt. It is more than that. The Mishkan is, as Rashi points out, a way of rectifying the sin of the Golden Calf. 

When it comes to repentance, one way to deal with sin is to curb desire toward some more positive end. But Shabbat teaches something more. Shabbat is a way of dealing with the sin of the Golden Calf, not by redirecting the desire, but by changing the self. The sanctity of Shabbat changes us such that we no longer desire the Golden Calf. Shabbat brings us to a place of evaluation, of seeing what is important, away from the bustle of the world and its artificial values. This cutting off—this escape to a restful spiritual place—helps us put our values in order, to see what is real and what is a mirage, and that all that glitters is not gold. And so though the Mishkan can curb our desire for the Golden Calf, Shabbat can transform us so we do not desire golden calves in the first place.