By what authority was Sunday Sabbath-keeping instituted?

Answer

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

How did Christ make it clear to them that the Scriptures testify of Him?
When and by what means will the effects of sin be removed?
How many were embraced in God's promises to Abraham?
What replies does Inspiration return to these inquiries?
Is there danger of delaying correction too long?
What power has claimed authority to change the law of God?
What will the ransomed of the Lord then do?

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