By what authority was Sunday Sabbath-keeping instituted?

Answer

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

What is said of Christ's childhood and early life?
How extensively did Christ make use of parables?
Was the ceremonial law a complete law in itself?
What example did Christ set in Sabbath observance?
When did Christ say the good would he recompensed?
What cheering promise is made to those who endure the trials and temptations of this life?
What has the Lord promised to be to the oppressed?

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