By what authority was Sunday Sabbath-keeping instituted?

Answer

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

What did Christ say of those who rejected John's message?
What were these gifts that Christ gave to men?
Why did God reprove Eli?
13. At the instance of church bishops, what still further law was secured under Theodosius the Younger, in 425?
What are God's people told to do at this time?
How does God regard one who abandons his faith?
How may one grow in grace?

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