By what authority was Sunday Sabbath-keeping instituted?

Answer

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

13. What three general divisions did Jesus recognize as including all the writings of the Old Testament?
What was the result of the Jews' not accepting Christ?
In what plain words did Christ foretell His resurrection?
How was the prophecy given?
What did God, through Moses, command Israel to make?
On what day did Paul and his companions preach to the devout women at Phillippi?
16. After the sealing work brought to view in Revelation 7, which takes place under the sixth seal, how is the seventh seal introduced?

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