Chapter 26 — Part III: The Decalogue — The Third Commandment
Section 24. The last day of the week was, therefore, chosen for the worship of God, and in this there is much that is symbolic. Hence in Exodus,' and in Ezechiel the Lord calls it a sign: See that you keep my sabbath because it is a sign between me and you in your generation, that you may know that I am the Lord who sanctify you.