Sabbath is a part of the old obsolete laws given to Jews. To Christians Jesus is our Sabbath and we are not to obey the old mosaic laws. We are to obey the moral laws of Christ only. The Judaizers and nomian nuts wants us to mutilate our foreskin, stop eating pork and strictly observe the few laws they observe which have no hold on Christians.
Col 2:16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
Mat 12:8 For the Son of man is Lord even of the sabbath day.
2Pe_3:8 But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years, and a thousand years as one day.
Rev_20:5 But the rest of the dead lived not again until the thousand years were finished. This is the first resurrection.
Rev_20:6 Blessed and holy is he that hath part in the first resurrection: on such the second death hath no power, but they shall be priests of God and of Christ, and shall reign with him a thousand years.
There is a totally different reason for us to not have to go by the Mosaic laws. The first thing is, all mankind save 8 people were destroyed by the flood and the Noahide laws came into effect after Noah came off the ark. What were they?
Gen 9:1 And God blessed Noah and his sons, and said unto them, Be fruitful, and multiply, and replenish the earth.
Gen 9:2 And the fear of you and the dread of you shall be upon every beast of the earth, and upon every fowl of the air, upon all that moveth upon the earth, and upon all the fishes of the sea; into your hand are they delivered.
Gen 9:3 Every moving thing that liveth shall be meat for you; even as the green herb have I given you all things.
Gen 9:4 But flesh with the life thereof, which is the blood thereof, shall ye not eat.
Gen 9:5 And surely your blood of your lives will I require; at the hand of every beast will I require it, and at the hand of man; at the hand of every man's brother will I require the life of man.
Gen 9:6 Whoso sheddeth man's blood, by man shall his blood be shed: for in the image of God made he man.
Gen 9:7 And you, be ye fruitful, and multiply; bring forth abundantly in the earth, and multiply therein.
Gen 9:8 And God spake unto Noah, and to his sons with him, saying,
Gen 9:9 And I, behold, I establish my covenant with you, and with your seed after you;
Gen 9:10 And with every living creature that is with you, of the fowl, of the cattle, and of every beast of the earth with you; from all that go out of the ark, to every beast of the earth.
Gen 9:11 And I will establish my covenant with you; neither shall all flesh be cut off any more by the waters of a flood; neither shall there any more be a flood to destroy the earth.
After Jesus was crucified and rose, a new covenant was made because there was fault found in Noah's covenant. What was that fault?
Heb_8:6 But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.
Heb_8:7 For if that first covenant had been faultless, then should no place have been sought for the second.
What was the fault of the first two covenants, the first by Moses and the second by Noah? See, God made three covenants with man, not just two. The third is the Christ Covenant. What is that?
Heb_8:10 For this is the covenant that I will make with the house of Israel after those days, saith the Lord; I will put my laws into their mind, and write them in their hearts: and I will be to them a God, and they shall be to me a people:
Heb 8:11 And they shall not teach every man his neighbour, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest.
Heb 8:12 For I will be merciful to their unrighteousness, and their sins and their iniquities will I remember no more.