Do Protestant writers acknowledge the same?

Answer

They do.
NOTE - "IS there no express commandment for observing the first day of the week as Sabbath,
instead of the seventh day?-None whatever. Neither Christ, nor His apostles, nor the first Christians
celebrated the first day of the week instead of the seventh as the Sabbath."-New York Weekly Tribune,
May 24, 1900.
"The Scriptures nowhere call the first day of the week the Sabbath. . . . There is no Scriptural
authority for so doing, nor of course any Scriptural obligation." The Watchman (Baptist).
"The observance of the first instead of the seventh day rests on the testimony of the church, and
the church alone.' -- Hobart Church News, July 2, 1894.
For additional testimonies, see reading on page 146.

With what measure of love should we serve others?
What record answers to this prophecy?
As He cried out in agony on the cross, and said, 9, thirst,\" what was given Him?
Why does the Lord call the Sabbath His day?
What are the three essentials to an official seal?
How does Paul again express this same truth?
How do evil spirits sometimes treat those thus possessed ?

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