By what authority was Sunday Sabbath-keeping instituted?

Answer

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

5. What further statement of Christ seems to lay the responsibility for the origin of sin upon Satan and his angels?
What blessed assurance is given all believers in Christ?
How does the death of Christ bear testimony to this?
What is the duty of every child?
What may be known with equal certainty when these signs have been seen?
What positive declaration does the apostle then make?
How often did David say he would pray?

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