By what authority was Sunday Sabbath-keeping instituted?

Answer

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

Why must justifying faith lay hold upon both the death and the resurrection of Christ?
What were some of the results of the preaching of the gospel under the outpouring of the Spirit?
What else does the prophecy say the little horn would do?
Because evil is not punished immediately, what presumptuous course do many pursue?
What was the Lord's covenant which they were to keep as their part of this covenant?
What day is the Sabbath, \"according to the commandment\"?
What, then, is the nature of all Sabbath legislation?

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