This book presents a hermeneutical and biblical analysis of how this day was instituted from creation and its use in both the Old Testament and the New Testament. In addition to focusing on the key role of Christ's work, death, and resurrection as the theological foundation of the essence of rest. It lays the groundwork for evaluating the meaning and implications of rest in both the Old Covenant and the New Covenant. Its institution in creation, promulgation through Moses, and its continuation and change in the New Covenant are explained. And it concludes with an evaluation of the precedents in the apostolic fathers and in the thought of John Calvin, ending with some useful advice for the contemporary practice of the Lord's Day.