By what authority was Sunday Sabbath-keeping instituted?

Answer

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

How did He further explain the new birth?
Why were the miracles of Christ recorded by the inspired writers?
What is sin declared to be?
On which day was a double portion of manna gathered?
Of what does God say the keeping or hallowing of the Sabbath is a sign?
For what purpose was the Revelation given?
Why did God give His only begotten Son to the world?

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