1920 U.S. Latin Church catechism, under Censor Librorum’s imprimatur [Note: the Sabbath is placed under the 3rd commandment in the Roman Catholic Church’s version of the Ten Commandments since the RCC subsumes the 2nd commandment into the 1st and splits the 10th commandment into two separate but similar commands]:
4. What day is reserved for God under the new law?
The first day of the week, called Sunday, or the Lord’s day.
5. Who made this substitution of Sunday for the Sabbath day?
It was made by the Apostles, by virtue of the authority which God had given them.
6. Why was the first day of the week substituted for the last day, as the Lord’s day ?
On account of the important events which occurred on that day. It was the first day of the creation of the world, the day on which Jesus Christ arose from the dead, and the day on which the Holy Ghost descended on the Apostles.
7. To what does the third commandment oblige us?
It obliges us to sanctify Sunday; that is, to abstain from servile works and to perform works of religion. Hence it contains two precepts: one negative, the other positive.
8. What must we especially avoid in order to sanctify Sunday?
We should carefully avoid all occasions of sin, such as exciting games, dangerous reading, balls, shows, taverns, etc.; otherwise we would convert the Lord’s day into Satan’s day, and a day of sanctification into one of damnation. (Manual of “Christian” Doctrine, comprising Dogma, Moral, and Worship, by a Seminary Professor, p. 259).