So that is your "substitute" for a Bible text supporting your speculation?
I just read from Malachi 3" "
I the LORD your God do not change"
and from Hebrews 13:8 "
Jesus Christ is the same yesterday, today, and forever."
And from Eph 6:2 that the unit of Ten - in which the 5th commandment is the "
FIRST Commandment with a promise" -- is still binding on all mankind. A Bible detail so obvious that even the majority of pro-sunday scholarship agree -- such as Spurgeon, Moody, R.C. Sproul, Stanley, the "Westminster Confession of Faith", the "Baptist Confession of Faith", Matthew Henry... et al "get that point".
Constantine, as I previously wrote put his redundant stamp...
And then I read from Mark 7:6-13 -- showing how "sola scriptura" testing of all doctrine and tradition - HAMMERS the traditions of man that seek to edit/alter/change the LAW of God.
Mark 7
7 Howbeit in vain do they worship me, teaching for doctrines the commandments of men.
8 For laying aside the Commandment of God, ye hold the tradition of men, as the washing of pots and cups: and many other such like things ye do.
9 And he said unto them, Full well ye reject the commandment of God, that ye may keep your own tradition.
10 For Moses said, Honour thy father and thy mother; and, Whoso curseth father or mother, let him die the death:
11 But ye say, If a man shall say to his father or mother, It is Corban, that is to say, a gift, by whatsoever thou mightest be profited by me; he shall be free.
12 And ye suffer him no more to do ought for his father or his mother;
13 Making the Word of God of none effect through your tradition, which ye have delivered: and many such like things do ye.
======================
Of course a few Catholics in the General theology section of this board object to the "Sola Scriptura" doctrine as I have quoted it from Mark 7:6-13, and Acts 17:11 testing all tradition and doctrine... but there we simply "agree to differ" -- you may choose tradition over the Bible in that case. But I do not.
hence your "speculative" web site said "
The 10 commandment law including the requirement to keep the Sabbath day were abolished at the cross"
http://www.bible.ca/H-sunday.htm
-- and by contrast the Word of God said
"Do we then abolish the LAW of God by our Faith? God forbid! In fact we ESTABLISH the LAW of God" Rom 3:31
Yet "another" opportunity to hammer the flaws traditions and doctrines of men via the WORD of God - "sola scriptura".
Thus even the Catholic Church is not entirely wrong when it says
"nothing is said in the bible about the change of the Lord's day from Saturday to Sunday..that is why we find so illogical the attitude of many non-Catholic who say they will believe nothing unless they can find it in the bible and yet will continue to keep Sunday as the Lord's day on the say-so of the Catholic church"