By what authority was Sunday Sabbath-keeping instituted?

Answer

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

What place has the will in determining whether man shall have life?
What do transgressors bring upon themselves?
31. What scripture shows that the righteousness which is received by grace through faith must not be made an excuse for continuing in sin?
How did Jesus show His loyalty to God?
21. What did this council, in its twenty-ninth canon, decree concerning the Sabbath and Christians who continued to observe it ?
Notwithstanding the lamb like appearance of this power, what is it ultimately to do?
What was one principal object in calling this council?

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