Rashi on Exodus 35:2/רש"י על שמות ל״ה:ב׳

1ששת 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).