Christian usage The ancient Romans traditionally used the eight-day
nundinal cycle, a market week, but in the time of
Augustus in the 1st century AD, a seven-day week also came into use. In
the gospels, the
women are described as coming to the empty tomb "", which literally means "toward the first of the sabbath" and is often translated "on the first day of the week".
Justin Martyr, in the mid-2nd century, mentions "memoirs of the apostles" as being read on "the day called that of the sun" (Sunday) alongside the "writings of the prophets." Some scholars believe this "was interpolated into his work at some later time". On 7 March 321,
Constantine I, Rome's first Christian emperor, decreed that Sunday would be observed as the Roman day of rest: In 363, Canon 29 of the
Council of Laodicea prohibited observance of the
Jewish Sabbath (Saturday), and encouraged Christians to work on Saturday and rest on the Lord's Day (Sunday). The fact that the canon had to be issued at all is an indication that adoption of Constantine's decree of 321 was still not universal, not even among Christians. It also indicates that Jews were observing the Sabbath on Saturday.
Modern practices First-day Sabbatarians, including Christians of the
Methodist,
Baptist and
Reformed (
Presbyterian and
Congregationalist) traditions, observe Sunday as the
sabbath, a day devoted to the worship of God at church (the attendance of
Sunday School, a
service of worship in the morning and evening), as well as a day of rest, meaning that people are free from servile labour and should refrain from trading, buying and selling except when necessary. For most Christians the custom and obligation of Sunday rest is not as strict. A minority of Christians do not regard the day they attend church as important, so long as they attend. There is considerable variation in the observance of Sabbath rituals and restrictions, but some cessation of normal weekday activities is customary. Many Christians today observe Sunday as a day of church attendance. In
Roman Catholic practice, on Sundays, church members "are bound to come together into one place so that, by hearing the
word of God and taking part in the
eucharist, they may call to mind the
passion, the resurrection and the
glorification of the Lord Jesus".
Liturgically, Sunday begins on Saturday evening. The evening Mass on Saturday is liturgically a full Sunday Mass and fulfills the obligation of Sunday Mass attendance, and
Vespers (evening prayer) on Saturday night is liturgically "first Vespers" of the Sunday. The same evening anticipation applies to other major solemnities and feasts, and is an echo of the Jewish practice of starting the new day at sunset. Those who work in the
medical field, in
law enforcement, and soldiers in a war zone are dispensed from the usual obligation to attend church on Sunday. They are encouraged to combine their work with attending religious services if possible. In the
Eastern Orthodox Church, Sunday begins at the
Little Entrance of Vespers (or
All-Night Vigil) on Saturday evening and runs until "
Vouchsafe, O Lord" (after the "
prokeimenon") of Vespers on Sunday night. During this time, the
dismissal at all services begin with the words, "May Christ our True God, who rose from the dead ...." Anyone who wishes to receive
Holy Communion at
Divine Liturgy on Sunday morning is required to attend Vespers the night before (see
Eucharistic discipline). Among Orthodox Christians, Sunday is considered to be a "Little
Pascha" (Easter), and because of the Paschal joy, the making of
prostrations is forbidden, except in certain circumstances. Some languages lack separate words for "Saturday" and "Sabbath" (e.g. Italian, Portuguese). Outside the English-speaking world,
Sabbath as a word, if it is used, refers to the Saturday, or the specific Jewish practices on it. Sunday is called the Lord's Day e.g. in Romance languages and Modern Greek. English-speaking Christians often refer to the Sunday as the Sabbath, other than Seventh-day Sabbatarians, a practice which, probably due to the international connections and the Latin tradition of the Roman Catholic Church, is more widespread among, but not limited to, Protestants.
Quakers traditionally referred to Sunday as "First Day" eschewing the
pagan origin of the English name, while referring to Saturday as the "Seventh day". Some Christian denominations, called "
Seventh-day Sabbatarians", observe a
Saturday Sabbath. Christians in the
Seventh-day Adventist,
Seventh Day Baptist, and
Church of God (Seventh-Day) denominations, as well as many
Messianic Jews, have maintained the practice of abstaining from work and gathering for worship on Saturdays (sunset to sunset) as did all of the followers of God in the
Old Testament. ==Sunday in Mandaeism==