Some interesting quotes:
The observance of the Lord's Day (Sunday) is founded not on any command of God, but on the authority of the Church." Augsburg Confession of Faith.
They [the Catholics] allege the Sabbath changed into Sunday, the Lord's day, contrary to the Decalogue, as it appears, neither is there any example more boasted of than the changing of the Sabbath day. Great, say they, is the power and authority of the church, since it dispensed with one of the Ten Commandments.
—Augsburg Confession of Faith, Art. 28, par. 9.
This 'handwriting of ordinances' our Lord did blot out, take away, and nail to His cross. (Colossians 2: 14.) But the moral law contained in the Ten Commandments, and enforced by the prophets, He did not take away.... The moral law stands on an entirely different foundation from the ceremonial or ritual law. ...Every part of this law must remain in force upon all mankind and in all ages.
—JOHN WESLEY, Sermons on Several Occasions, 2-Vol. Edition, Vol. I, pages 221, 222.
The sacred name of the Seventh day is Sabbath. This fact is too clear to require argument [Exodus 20:10 quoted]… on this point the plain teaching of the Word has been admitted in all ages… Not once did the disciples apply the Sabbath law to the first day of the week, -- that folly was left for a later age, nor did they pretend that the first day supplanted the seventh.
—Joseph Hudson Taylor, ‘The Sabbatic Question’, p. 14-17, 41.
It is well to remind the Presbyterians, Baptists, Methodists, and all other Christians, that the Bible does not support them anywhere in their observance of Sunday. Sunday is an institution of the Roman Catholic Church, and those who observe the day observe a commandment of the Catholic Church.
—Priest Brady, in an address, reported in the Elizabeth, NJ ‘News’ on March 18, 1903.
I wonder exceedingly how it came to be imputed to me that I should reject the law of Ten Commandments...Whosoever abrogates the law must of necessity abrogate sin also.
—MARTIN LUTHER, Spiritual Antichrist, pages 71, 72.
The Sabbath was binding in Eden, and it has been in force ever since. This fourth commandment begins with the word 'remember,' showing that the Sabbath already existed when God wrote the law on the tables of stone at Sinai. How can men claim that this one commandment has been done away with when they will admit that the other nine are still binding?
—D.L. MOODY, Weighed and Wanting, page 47.
Many people think that Sunday is the Sabbath. But neither in the New Testament nor in the early church is there anything to suggest that we have any right to transfer the observance of the seventh day of the week to the first. The Sabbath was and is Saturday and not Sunday, and if it were binding on us then we should observe it on that day, and on no other.
—Rev. Lionel Beere, All-Saints Church, Ponsonby, N.Z. in Church and People, Sept. 1, 1947.