By what authority was Sunday Sabbath-keeping instituted?

Answer

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

At the conclusion of Daniel's prayer, what assurance did Gabriel give him?
14. What did He say of those who should break one of God's commandments, or should teach men to do so?
What system was established on account of man's transgression of the law of God?
What change will then take place in both the living and the sleeping saints?
As soon as the wicked are raised, what does Satan at once proceed to do?
What did John see in the right hand of Him who sat on the throne ?
Why does God wish us to trust in Jesus?

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