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.

How does David express this same truth?
What is the final result or fruit of sin?
What portion of this period was to reach to Christ, the Messiah, or Anointed One?
When Christ thus ministers the law in the heart, what does it become?
Why did the patriarch Job offer burnt offerings?
For what purpose are we to remember the Sabbath day?
What is the measurement of the city?

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