The Old Testament discloses a robust cluster of institutions for Israel to keep liturgical time. The Sabbath is the principle of its full, annual calendar. The New Testament, in its brevity, discloses only one day, called "the first day of the week" and "the Lord's Day." The Church, as heirs of both testaments, keeps Sunday in some places, and a whole calendar--the Church Calendar--in others. This microcourse pays close attention to the New Testament's reception and development of the Old Testament's liturgical institutions, and especially that reception and development in Luke's gospel. This series of Scriptural studies compasses the meaning of the Sabbath in the Pentateuch; the relationship between history and holidays in Scripture; and Luke's use of the Sabbath, the Passover, and the Feast of Firstfruits. As it investigates the Scriptural shape of liturgical time, it asks the questions, How does Scripture prompt the Church to keep liturgical time, and What does Sunday mean?