Sabbath different from Shabbat
Christianity
In Eastern Christianity, the Sabbath is considered still to be on Saturday, the seventh day, in remembrance of the Hebrew Sabbath. In Catholicism and most branches of Protestantism, the "Lord's Day" (Greek Κυριακή) is considered to be on Sunday, the first day (and "eighth day"). Communal worship, including the Holy Mysteries, may take place on any day, but a weekly observance of the resurrection is made consistently on Sunday. Western Christianity sometimes refers to the Lord's Day as a "Christian Sabbath", distinct from the Hebrew Sabbath, but related in varying manner.