By what authority was Sunday Sabbath-keeping instituted?

Answer

By the authority of the Catholic Church. See page 131.

To whom, therefore, should we ascribe glory and honor?
Why did the apostle say this duty was so imperative?
What should be the prayer of every parent?
18. Before giving the law at Sinai, what did God say because some of the people went out to gather manna on the seventh day?
6. What occurred at the time of the crucifixion which indicated that the typical system had been taken away by Christ?
7. What reason does God give for the Sabbath's being an everlasting sign between Him and His people?
When the sign appeared, how suddenly were they to flee?

Questions & Answers are from the book Bible Readings for the Home Circle