By what authority was Sunday Sabbath-keeping instituted?

Answer

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

Whose workmanship is the Christian?
Which are some of the most touching and soul-winning of Christ's parables?
What reason is given in the fourth commandment for keeping the Sabbath day holy?
At His ascension, how did the angels say Christ would come again?
What is the next event mentioned in the prophecy?
What warning has been given us through the Apostle Peter?
Of what material is the wall constructed?

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