Shemot 20:8-11

Remember Yom HaShabbos, to keep it kodesh. Sheshet yamim shalt thou labor, and do all thy work: But the Yom HaShevi'i is the Shabbos of HASHEM Eloheicha; in it thou shalt not do any melachah, thou, nor thy ben, nor thy bat, thy eved, nor thy maidservant, nor thy cattle, nor thy ger that is within thy gates; For in sheshet yamim HASHEM made Shomayim and Ha'Aretz, the yam, and all that in them is, and rested Yom HaShevi'i; for this reason HASHEM blessed Yom HaShabbos, and set it apart as kodesh.