In the Islands we say "same dog puppy" which roughly translated is equivalent to "six or half dozen". It means it all comes from the same source and that source is not the Bible, it is from another source which has no divine or scriptural basis.
I went over the early church history and here is some of the texts relating to Sabbath from the early church by J.N Andrew:
"....The following are all the hints respecting the nature of first-day observance during the first
three centuries. The epistle falsely ascribed to Barnabas simply says: "We keep the eighth day
with joyfulness."1 Justin Martyr, in words already quoted at full length, describes the kind of
meeting which they held at Rome and in that vicinity on that day, and this is all that he
connects with its observance.2 Irenaeus taught that to commemorate the resurrection, the knee
must not be bent on that day, and mentions nothing else as essential to its honor. This act of
standing in prayer was a symbol of the resurrection, which was to be celebrated only on that
day, as he held.3 Bardesanes the Gnostic represents the Christians as everywhere meeting for
worship on that day, but he does not describe that worship, and he gives no other honor to the
day.4 Tertullian describes Sunday observance as follows: "We devote Sunday to rejoicing,"
and he adds, "We have some resemblance to those of you who devote the day of Saturn to
ease and luxury."5 In another work he gives us a further idea of the festive character of
Sunday. Thus he says to his brethren: "If any indulgence is to be granted to the flesh, you
have it. I will not say your own days, but more too; for to the heathens each festive day occurs
but once annually; you have a festive day every eighth day."6 Dr. Heylyn spoke the truth
when he said:
"Tertullian tells us that they did devote the Sunday partly unto mirth and
recreation, not to devotion altogether; when in a hundred years after
Tertullian's time there was no law or constitution to restrain men from labor on
this day in the Christian church."7
The Sunday festival in Tertullian's time was not like the modern first-day Sabbath, but was
essentially the German festival of Sunday, a day for worship and for recreation, and one on
which labor was not sinful. But Tertullian speaks further respecting Sunday observance, and
the words now to be quoted have been used as proof that labor on that day was counted sinful.
This is the only statement that can be found prior to Constantine's Sunday law that has such
an appearance, and the proof is decisive that such was not its meaning. Here are his words:
"We, however (just as we have received), only on the day of the Lord's
resurrection, ought to guard, not only against kneeling, but every posture and
office of solicitude, deferring even our businesses, lest we give any place to the
devil. Similarly, too, in the period of Pentecost; which period we distinguish
by the same solemnity of exultation."8
He speaks of "deferring even our businesses;" but this does not necessarily imply anything
more than its postponement during the hours devoted to religious services. It falls very far
short of saying that labor on Sunday is a sin. But we will quote Tertullian's next mention of
Sunday observance before noticing further the words last quoted. Thus he says:
"We count fasting or kneeling in worship on the Lord's day to be unlawful. We
rejoice in the same privilege also from Easter to Whitsunday."9
These two things, fasting and kneeling, are the only acts which the fathers set down as
unlawful on Sunday, unless, indeed, mourning may be included by some in the list. It is
certain that labor is never thus mentioned. And observe that Tertullian repeats the important
statement of the previous quotation that the honor due to Sunday pertains also to the "period
of Pentecost," that is, to the fifty days between Easter and Passover and Whitsunday or
Pentecost. If, therefore, labor on Sunday was in Tertullian's estimation sinful, the same was
true for the period of Pentecost, a space of fifty days! But this is not possible. We can
conceive of the deferral of business for one religious assembly each day for fifty days, and
also that men should neither fast nor kneel during that time, which was precisely what the
religious celebration of Sunday actually was. But to make Tertullian assert that labor on
Sunday was a sin is to make him declare that such was the case for fifty days together, which
no one will venture to say was the doctrine of Tertullian...."
"....Justin Martyr has four reasons:
1. "It is the first day on which God having wrought a change in the darkness
and matter, made the world."19
2. "Jesus Christ our Saviour on the same day rose from the dead."20
3. "It is possible for us to show how the eighth day possessed a certain
mysterious import, which the seventh day did not possess, and which was
promulgated by God through these rites,"21 i.e., through circumcision.
4. "The command of circumcision, again, bidding [them] always circumcise
the children on the eighth day, was a type of the true circumcision, by which
we are circumcised from deceit and iniquity through Him who rose from the
dead on the first day after the Sabbath."22 ....."
"....Origen seems to have been of Tertullian's judgment as to the inconclusiveness of the
arguments adduced by his predecessors. He therefore coined an original argument which
seems to have been very conclusive in his estimation as he offers this alone. But he must have
forgotten that the manna fell on all the six working days, or he would have seen that while his
argument does not elevate Sunday above the other five working days, it does make the
Sabbath the least reputable day of the seven! And yet the miracle of the manna was expressly
designed to set forth the sacredness of the Sabbath and to establish its authority before the
people...."
".....Next in order come the Apostolic Constitutions, which assert that the Sunday festival is a
memorial of the resurrection:
"But keep the Sabbath, and the Lord's day festival; because the former is a
memorial of the creation, and the latter of the resurrection."28
The writer, however, offers no proof that Sunday was set apart by divine authority in memory
of the resurrection....."
"....There is yet another of the fathers of the first three centuries who gives the reasons then used
in support of the Sunday festival.
This is the writer of the Syriac Documents concerning Edessa. He comes next in order and
closes the list. Here are four reasons:
1. "Because on the first day of the week our Lord rose from the place of the
dead."30
2. "On the first day of the week he arose upon the world,"31 i.e., he was born
upon Sunday.
3. "On the first day of the week he ascended upon to Heaven."32
4. "On the first day of the week he will appear at last with the angels of
Heaven."33
The first of these reasons is as good a one as man can devise out of his own heart for doing
what God never commanded; the second and fourth are mere assertions of which mankind
know nothing; while the third is a positive untruth....."