The Lord's Day in Christianity is generally Sunday, the principal day of communal worship. It is observed by most Christians as the weekly memorial of the resurrection of Jesus Christ, who is said in the canonical Gospels to have been witnessed alive from the dead early on the first day of the week. The phrase appears in . According to some sources, Christians held corporate worship on Sunday in the 1st century. (First Apology, chapter 67), and by 361 AD it had become a mandated weekly occurrence. 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 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. In Christian calendars, Sunday is regarded as the first day of the week. Biblical use The phrase the "Lord's Day" appears 21 times in Bible, even though many believe it appears only once in the Bible, in which was written near the end of the first century. It is the English translation of the Koine Greek Kyriake hemera. The adjective kyriake ("Lord's") often elided its noun, as in the neuter kyriakon for "Lord's [assembly]", the predecessor of the word "church"; the noun was to be supplied by context. Revelation 1:10 used Kyriake hemera (Κυριακῇ ἡμέρᾳ, "I was in the Spirit on the Lord's Day") in a way apparently familiar to his readers. Early Christians understood this meant he was worshiping on Sunday, resurrection day. The Apostle appears