The observance of Sunday as a day of worship and rest is a form of first-day Sabbatarianism, a view which was historically heralded by nonconformist denominations, such as Congregationalists, Presbyterians, Methodists, Moravians, Quakers and Baptists, as well as many Episcopalians. Among Sunday Sabbatarians (First-day Sabbatarians), observance of the Lord's Day often takes the form of attending the Sunday morning service of worship, receiving catechesis through Sunday School, performing acts of mercy (such as evangelism, visiting prisoners in jails and seeing the sick at hospitals), and attending the Sunday evening service of worship, as well as refraining from Sunday shopping, servile work, playing sports, viewing the television, and dining at restaurants. The impact of first-day Sabbatarianism on Western culture is manifested by practices such as Sunday blue laws.
Seventh-day Sabbatarianism is a movement that generally embraces a literal reading of the Sabbath commandment that provides for both worship and rest on Saturday, the seventh day of the week. Seventh-day Baptists leave most other Sabbath considerations of observance to individual conscience. The Sabbatarian Adventists (Seventh-day Adventist Church, Davidian Seventh-day Adventists, Church of God (Seventh Day), and others) have similar views, but maintain the original, scriptural duration as Friday sunset through Saturday sunset. The Orthodox Tewahedo Churches in Ethiopia and Eritrea observe the seventh-day Sabbath, as well as Sunday as the Lord's Day. Likewise, the Coptic Church, another Oriental Orthodox body, "stipulates that the seventh-day Sabbath, along with Sunday, be continuously regarded as a festal day for religious celebration." The Eastern Orthodox Church also upholds that the Sabbath is still on Saturday. Seventh-day Sabbatarianism also includes Sabbatarian Pentecostalists (True Jesus Church, Soldiers of the Cross Church), Armstrongism, modern Judaisers (like, Hebrew Roots movement), and others.
Its historical origins lie in early Christianity, later in the Eastern Church and Irish Church, and then in Puritan Sabbatarianism, which delineated precepts for keeping Sunday, the Lord's Day, holy in observance of Sabbath commandment principles.
Non-Sabbatarianism is the view opposing all Sabbatarianism, declaring Christians to be free of mandates to follow such specific observances. It upholds the principle in Christian church doctrine that the church is not bound by such law or code, but is free to set in place and time such observances as uphold Sabbath principles according to its doctrine: to establish a day of rest, or not, and to establish a day of worship, or not, whether on Saturday or on Sunday or on some other day. It includes some nondenominational churches.