High Quality Content by WIKIPEDIA articles! Lord`s Day in Christianity is generally Sunday, the 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. (A minority of Christians hold that the term "Lord`s Day" can only properly refer to seventh-day Sabbath or Saturday.) The phrase appears in Rev. 1:10.