By what authority was Sunday Sabbath-keeping instituted?

Answer

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

From what is a converted sinner saved?
What does Christ declare Himself to be?
How much was included in the gift of Christ for the salvation of man?
What did He teach concerning the stability of the law?
What has always been the result of religious legislation or a union of church a state ?
But are not the righteous dead in heaven?
For what purpose did God give His Son to the world?

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