By what authority was Sunday Sabbath-keeping instituted?

Answer

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

With whom did sin originate?
How is the fulfilment of this prophecy recorded?
12. After the subjects of the kingdom have been determined by the investigative judgment, what is given to Christ?
Does faith in God make void the law?
With what do these trumpets deal?
6. Looking forward to the conflicts through which His followers must pass, what cheering message did Christ send them through the Apostle John?
What will cause the Christian to grow?

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