OK here we go...
First off, I am exploring the subject of Sabbath and would appreciate response to what I have come to so far.
I am aware that among us are folks well informed in the several areas of study that touch the subject.
My position is not rigid but certain theological non-negotiables come into play.
From my knowledge of scripture I conclude the following.
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The 'days' in
Genesis 1 are 'God' days as He said a day to Him was as 1000 years... The term 1000 years simply indicates a long time.
After the six days of creation God entered His Seventh Day. This was not an 'earth day' of 24 hours - in fact it continues today otherwise the promise of entering His Sabbath Rest in Heb 3 and 4 does not hold.
The Sabbath for man was not established until Exodus at which point it was anchored in chronological time. I don't believe Adam and Eve kept the Sabbath.
When the temple veil was rent from the top, the authority that came with the curses of the Law was broken including the consequences of not keeping the Sabbath.
Paul clearly underlines God's plan for our Sabbath Rest post cross in Heb 3 and 4.
It is the same invitation that was given in ages past - to enter the Rest of His Sabbath (not the Sabbath made for man that was established in Exodus.) and this was a rest experienced every day because His Sabbath has not ended. That is why the text continually says "Today if you hear my voice... "
So entering His rest daily also satisfies the Law of the Spirit for believers which and has replaced the authority the Law of Moses.
The demands of the Law of the Spirit are greater than the Mosaic Law as we are accountable to His voice within and the fear of Him as prophesied by Jeremiah.
The conclusion then is that the day we gather for worship is not a matter to be concerned about. Believers who understand and appropriate by faith His Sabbath Rest have more than satisfied the intent of the Heart of God in making the Sabbath for man, every day for the week.
However it is fitting to have a weekly memorial around His Resurrection as the fact of this event is the central hub of the faith. This makes Sunday the obvious choice.
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I have not underpinned these points with specific scripture at this stage but if there are questions around the matters I have raised we can discuss the Biblical support or otherwise.
Thank you for your time and patience.