Free Presbyterian Church of Ulster in the context of "Sabbatarianism"

In Christianity, the Lord's Day refers to Sunday, the traditional day of communal worship. It is the first day of the week in the Hebrew calendar and traditional Christian calendars. It is observed by most Christians as the weekly memorial of the resurrection of Jesus Christ, who is said to have been raised from the dead early on the first day of the week. The phrase appears only once in Rev. 1:10 of the New Testament.

According to Beckwith, Christians held corporate worship on Sunday in the 1st century (First Apology, chapter 67). On 3 March 321, Constantine the Great legislated rest on the pagan holiday Sunday (dies Solis). Before the Early Middle Ages, the Lord's Day became associated with Sabbatarian (rest) practices legislated by Church Councils. Christian denominations such as the Reformed Churches, Methodist Churches, and Baptist Churches regard Sunday as the Christian Sabbath, a practice known as first-day Sabbatarianism. First-day Sabbatarian (Sunday Sabbatarian) practices include attending morning and evening church services on Sundays, receiving catechesis in Sunday School on the Lord's Day, taking the Lord's Day off from servile labour, not eating at restaurants on Sundays, not Sunday shopping, not using public transportation on the Lord's Day, not participating in sporting events that are held on Sundays, as well as not viewing television and the internet on Sundays; Christians who are Sunday Sabbatarians often engage in works of mercy on the Lord's Day, such as evangelism, as well as visiting prisoners at jails and the sick at hospitals and nursing homes. A Sunday custom present in many Christian countries is the "hearing" (abhören) of children at dinnertime, in which the parents listen while the children recall what their pastor preached about in the Sunday sermon; if any corrections are needed, the parents instruct them.

The Democratic Unionist Party (DUP) is a unionist, loyalist, British nationalist and national conservative political party in Northern Ireland. It was founded in 1971 during the Troubles by Ian Paisley, who led the party until 2008. It is currently led by Gavin Robinson, who initially stepped in as an interim after the resignation of Jeffrey Donaldson. It is the second-largest party in the Northern Ireland Assembly, and won five seats in the House of Commons of the United Kingdom at the 2024 election. The party has been mostly described as right-wing and socially conservative, being anti-abortion and opposing same-sex marriage. The DUP sees itself as defending Britishness and Ulster Protestant culture against Irish nationalism and republicanism. It is also Eurosceptic and supported Brexit.

The DUP evolved from the Protestant Unionist Party and has historically strong links to the Free Presbyterian Church of Ulster, the church Paisley founded. During the Troubles, the DUP opposed sharing power with Irish nationalists or republicans as a means of resolving the conflict, and likewise rejected attempts to involve the Republic of Ireland in Northern Irish affairs. It campaigned against the Sunningdale Agreement of 1973, the Anglo-Irish Agreement of 1985, and the Good Friday Agreement of 1998. In the 1980s, the DUP was involved in setting up the loyalist paramilitary movements Third Force and Ulster Resistance, the latter of which helped smuggle a large shipment of weapons into Northern Ireland.

Many Christians observe a weekly day set apart for rest and worship called a Sabbath in obedience to God's commandment to remember the Sabbath day, to keep it holy.

Early Christians, at first mainly Jewish, observed the seventh-day (Saturday) Sabbath with prayer and rest. At the beginning of the second century the Church Father Ignatius of Antioch approved non-observance of the Sabbath. The now majority practice of Christians is to observe the first day of the week (Sunday), called the Lord's Day, when many significant events occurred during the New Testament - notably the Resurrection - rather than the biblical seventh-day Sabbath as a day of rest and worship.

Sabbatarianism advocates the observation of the Sabbath in Christianity, in keeping with the Ten Commandments.

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 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.