By what authority was Sunday Sabbath-keeping instituted?

Answer

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

How perfect is the unity into which believers are brought by being baptized into Christ?
For what purpose is the manifestation of this one Spirit given?
For how long does marriage bind the contracting parties?
Why did Adam call his wife's name Eve?
Into what perplexity did Christ's working of miracles on the Sabbath throw the Pharisees?
How enduring is this kingdom to be?
Why are its gates not to be closed?

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