By what authority was Sunday Sabbath-keeping instituted?

Answer

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

4. After Daniel and his fellows had sought God earnest1y, how were the dream and its interpretation revealed to Daniel?
Under the new covenant, what does God promise to do?
8. Did God bless and sanctify the seventh day while He was resting upon it, or when His rest on that day was past?
On which day was a double portion of manna gathered?
20. When and by what church council was the observance of the seventh day forbidden, and Sunday observance enjoined ?
What will Christ do with the saints when He comes?
How did Elijah pray before obtaining his request?

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