Shabbat, lasting from sunset Friday night to the appearance of three stars on Saturday night, celebrates God's creation with a day of rest that commemorates God's day of rest upon the completion of creation. It plays an important role in Jewish practice and is the subject of a large body of religious law. The most notable law with regard to observation of Jewish Sabbath is the requirement to abstain from creative work of any kind (the most widely known implication of this being the prohibition against kindling a fire). Observant Jews will prepare food ahead of time to avoid having to cook on Sabbath, and observant Orthodox Jews will avoid turning on electric lights (which "creates" an electric circuit) or driving.