By what authority was Sunday Sabbath-keeping instituted?

Answer

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

What should we say for such a Saviour?
From whom does faith come?
What is the very life of the Spirit?
Why is the execution of the judgment given to Christ?
What do Catholics say of the observance of Sunday by Protestants?
How does the Sunday law of Charles 11, of 1676, read?
What did David say with reference to his being afflicted?

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