Whose handiwork is it[1]
ויקהל משה את-כל-עדת בני ישראל ויאמר אלהם אלה הדברים אשר-צוה יקוק לעשת אתם: ששת ימים תֵּעָשֶׂה מלאכה וביום השביעי יהיה לכם קדש שבת שבתון ליקוק וגו’
Moshe gathered the entire assembly of the Jewish people and said to them: “These are the matters that Hashem commanded to do. Six days work shall be done, and on the seventh day it will be for you a holy sabbatical Shabbos for Hashem”[2]
Our Sages note[3] an interesting juxtaposition between the commandments regarding Shabbos and the building of the Mishkan. It is understood that the Torah is telling us not to build the Mishkan on Shabbos. This is the basis for the prohibited creative labor on Shabbos, namely any activity involved in the creation of the Mishkan is forbidden to perform on Shabbos.