By what authority was Sunday Sabbath-keeping instituted?

Answer

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

In receiving the Son what do we have in Him?
To whom, therefore, should we ascribe glory and honor?
In His teaching, to what did Christ direct attention?
Concerning what subject ought we to be informed?
What is said of his mother and his grandmother?
What will occur when the Lord descends from heaven?
While suffering in the garden of Gethsemane, how was Christ strengthened?

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