The seventh-day Sabbath, observed from Friday evening to Saturday evening, is an important part of the beliefs and practices of seventh-day churches. These churches emphasize biblical references such as the ancient Hebrew practice of beginning a day at sundown, and the Genesis creation narrative wherein an "evening and morning" established a day, predating the giving of the Ten Commandments. They hold that the Old and New Testament show no variation in the doctrine of the Sabbath on the seventh day. Saturday, or the seventh day in the weekly cycle, is the only day in all of scripture designated using the term Sabbath. The seventh day of the week is recognized as Sabbath in many languages, calendars, and doctrines, including those of Catholic, Lutheran, and Orthodox churches.[a]

In Abrahamic religions, the Sabbath or Shabbat is a day set aside for rest and worship. According to the Book of Exodus, the Sabbath is a day of rest on the seventh day, commanded by God to be kept as a holy day of rest, as God rested from creation. The practice of observing the Sabbath (Shabbat) originates in the biblical commandment "Remember the sabbath day, to keep it holy".