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.

What did He say to the two blind men as He healed them ?
What did Pilate propose to do when Christ was again brought before him?
What is it that makes a thing holy?
How does Isaiah speak of the wicked at this time?
What words to this church show the second advent near?
For what did Job say he would wait after death?
What reason does Paul give to encourage us to entertain strangers?

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