שֵׁ֣שֶׁת יָמִים֮ תֵּעָשֶׂ֣ה מְלָאכָה֒ וּבַיּ֣וֹם הַשְּׁבִיעִ֗י יִהְיֶ֨ה לָכֶ֥ם קֹ֛דֶשׁ שַׁבַּ֥ת שַׁבָּת֖וֹן לַיהוָ֑ה כָּל־הָעֹשֶׂ֥ה ב֛וֹ מְלָאכָ֖ה יוּמָֽת׃
六天要做工，但第七天對你們來說是聖日，是歸永恆者的安息日，是完全安息的日子；凡在這日做工的，必被處死。
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.