שֵׁ֣שֶׁת יָמִים֮ תֵּעָשֶׂ֣ה מְלָאכָה֒ וּבַיּ֣וֹם הַשְּׁבִיעִ֗י יִהְיֶ֨ה לָכֶ֥ם קֹ֛דֶשׁ שַׁבַּ֥ת שַׁבָּת֖וֹן לַיהוָ֑ה כָּל־הָעֹשֶׂ֥ה ב֛וֹ מְלָאכָ֖ה יוּמָֽת׃
Przez sześć dni wykonywana będzie robota, ale dzień siódmy będzie wam święty, Sabbat najwyższy Wiekuistemu; ktoby wykonał w nim robotę, wydany będzie na śmierć.
Rashi
ששת ימים SIX DAYS [MAY WORK BE DONE] — He intentionally mentioned to them the prohibition in reference to the Sabbath before the command about the building of the Tabernacle in order to intimate that it does not set aside (supersede) the Sabbath (cf. Mekhilta).
Sforno
וביום השביעי יהיה לכם קדש, and you may not violate the Sabbath even in order to complete the Tabernacle sooner, although the work on the Tabernacle is also a sacred task.
Or HaChaim
ששת ימים תעשה מלאכה, "during six days work shall be performed, etc." The reason the Torah emphasises the work to be performed on the weekdays may simply be a hint that if one observes the seventh day as a holy day, the work required for our maintaining ourselves during the subsequent six days will take care of itself.