(1) Thus saith Jehovah, Keep ye justice, and do righteousness; for my salvation is near to come, and my righteousness to be revealed. (2) Blessed is the man that doeth this, and the son of man that holdeth it fast; that keepeth the sabbath from profaning it, and keepeth his hand from doing any evil. (3) Neither let the foreigner, that hath joined himself to Jehovah, speak, saying, Jehovah will surely separate me from his people; neither let the eunuch say, Behold, I am a dry tree. (4) For thus saith Jehovah of the eunuchs that keep my sabbaths, and choose the things that please me, and hold fast my covenant: (5) Unto them will I give in my house and within my walls a memorial and a name better than of sons and of daughters; I will give them an everlasting name, that shall not be cut off. (6) Also the foreigners that join themselves to Jehovah, to minister unto him, and to love the name of Jehovah, to be his servants, every one that keepeth the sabbath from profaning it, and holdeth fast my covenant; (7) even them will I bring to my holy mountain, and make them joyful in my house of prayer: their burnt-offerings and their sacrifices shall be accepted upon mine altar; for my house shall be called a house of prayer for all peoples. (8) The Lord Jehovah, who gathereth the outcasts of Israel, saith, Yet will I gather others to him, besides his own that are gathered. Isaiah 56:1-8 ASV
One day of God is not the same as one day of men. One Biblical day covers 2 days of men
There were also 7 other sabbath days in the Law of Moses. Which one was spoken of in the day of the burial of Jesus?
False reasonings for not keeping the shabbat or any other doctrine of the Law of Moses
However, if the Law is no more, there is no need of keeping the whole Law according to James 2:10 and there is no more sin according to Paul.