By what authority was Sunday Sabbath-keeping instituted?

Answer

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

Through what instrumentality is conversion wrought?
While at the high priest's house, how did Peter deny Him?
Why was it necessary for Christ to go away?
Under the theocracy, how were the rebellious or willful transgressors treated ?
What warlike scene is given under this trumpet?
What is our duty toward the outcast and wandering?
How readily will their wants be supplied?

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