By what authority was Sunday Sabbath-keeping instituted?

Answer

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

How does the Spirit witness to our acceptance with God?
What did Christ indicate as essential to eternal life?
What command did the Lord later give to Abraham?
19. In what prophetic language was the varying strength of the ten kingdoms of the divided empire indicated?
What wonderful demonstration will accompany the Lord's coming?
What was the character of Christ's work among men?
When the Jews rejected Paul's preaching of the gospel, what did he and Barnabas say?

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