By what authority was Sunday Sabbath-keeping instituted?

Answer

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

How perfect does Christ tell His followers to be?
When David confessed his sin, what did he say God did?
What was the result of Christ's working miracles at His first passover?
How often will they congregate to worship the Lord?
What is to be finished when the seventh trumpet is about to sound?
What above all else shows God's willingness to do this?
How did Elijah pray before obtaining his request?

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