The true in the bible is,God appointed to Christians another day,not the seventh day.
In Hebrews 4,this is what the apostle paul is explaining to the original sabbath keepers,the Hebrews, the Hebrews are the original sabbath keepers and the Apostle paul is saying that the sabbath for Christians is not the sabbath that was taught by joshua and moses to the isrealites. Hebrews 4 verse 8 says;
For if joshua had given them rest,then would he not afterward have spoken of another day.
God has spoken of another day,not the sabbath that joshua and moses implemented among the isrealites. That why the bible tells us,the apostle paul explaining to the original sabbath keepers, the Hebrews that God has spoken of another day,not the seventh day sabbath.
In fact,the lord jesus christ did not observe the seventh day sabbath. John 5 verse 16
And therefore did the Jews persecute jesus,and sought slay him,because he had done these things on the sabbath day.
John 5 verse 17
But jesus answered them,my father worketh hitherto, and I work.there really an end, an end to the seventh day sabbath because it was pre_ordained by God that covenant of the sabbath and the convenant of moses shall end in a particular period of time.let us prove that,the observance of sabbath,new moons, etc are not anymore in existence.
When the time of the lord jesus christ came. Hebrew 7 verse 12 says, For the priesthood being changed, there is made of necessity a change also of the law.
The law of moses was not anymore taught by the lord jesus christ it was is law that we must obey. The law of christ, not the law of moses anymore.
In the new testament the real sabbath day is another day it is not the seventh day.