By what authority was Sunday Sabbath-keeping instituted?

Answer

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

What is the result of faith's being put to the test?
Why does God manifest such mercy and long-suffering toward men?
How heavy was the burden which rested on His soul on the night of His betrayal?
For whom has a book of remembrance been written?
What is the result of willful sin?
What kind of mind is not subject to the law of God?
Where are the dead when they hear the voice of Christ calling them to life?

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