By what authority was Sunday Sabbath-keeping instituted?

Answer

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

What did Christ say to the Jews concerning the study of the Scriptures?
Into what relationship to God does His love bring us?
What spirit must those cherish whom God forgives?
What is the first and primary evidence of our acceptance with God?
On what day did Paul and Barnabas preach at Antioch?
When did Paul expect to receive his crown?
What promise has God made to bereaved mothers?

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