By what authority was Sunday Sabbath-keeping instituted?

Answer

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

How may we know that we are the sons of God?
31. What scripture shows that the righteousness which is received by grace through faith must not be made an excuse for continuing in sin?
What was Jesus doing when they found Him?
What New Testament injunction is given respecting marriage?
27. According to the view of the judgment presented to Daniel, what is to be given to Christ while still before the Father?
Through whom do we have sanctification?
What promises are made by Christ to the overcomer?

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