By what authority was Sunday Sabbath-keeping instituted?

Answer

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

How did Christ teach the people?
What place has the Sabbath in the work of salvation?
What is the essential teaching of the new covenant?
When Christ came to this earth, what was His attitude toward God's will, or law?
How is the character of the law described by the Apostle Paul?
What is Peter's testimony regarding it?
How was Peter delivered later?

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