By what authority was Sunday Sabbath-keeping instituted?

Answer

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

Can anyone boast of sinlessness?
Who does the apostle say saw Christ after He was risen?
By what means may the mother bind the hearts of the loved ones at home together?
Against what evil should fathers guard?
What besides creation were Israel to remember when they kept the Sabbath?
What day is especially indicated as the day to prepare for the Sabbath?
What experience followed this trust in Jesus?

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