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?
How did some of the believers at Ephesus testify to the sincerity of the confession of their sins?
Through what does grace reign unto eternal life?
After the law had been proclaimed from Sinai, what did the people again say?
At His ascension, how did the angels say Christ would come again?
What divine law of retroaction attends giving?
When she persisted in her request, and fell down to worship Him, what did He say?

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