Since even the definition of Saturday means the 7th day, I observe the Sabbath Friday at dusk until Saturday at dusk. After god finished his creation, it makes perfect sense that this is the proper time. In fact Sunday only came into the picture by the Romans, since it was the Pagan religion day, when they worshipped the sun. Hence, SUNday. Sunday is the 1st day of the week. Not the last. People probably tried to change the Sabbath to Sunday to set themselves apart from the Jews. Properly observing the Sabbath and keeping it holy is one of the 10 commandments. Which surprises me that so many Christians don't even observe the Sabbath at all. There's also regulations to properly observe it. Which probably the majority of Christians are clueless about. I would recommend getting a Torah book. (the 5 books of Moses) since this book is translated word for word. Unlike what your probably reading right now. Which changes phrases, and words. King James is the very worst. In fact go ahead and compare the Torah to whatever bible your reading now. By 1 word being mistranslated, it can change the whole meaning
Matthew 5:17 Jesus tells us he's the Fulfillment of the law. He came to expand it and fill it out for what it truly meant. For example, The Old Testament said you should not commit murder, But Jesus fills it out and says if you have anger in your heart against the brother then you have committed murder and your heart. Colossians chapter 2 verse 17 specifically says that Jesus put away tradition in the law that was burdensome when he was crucified on the cross. In the nail in the coffin is Hebrews chapter 8 verse 8 which says in plain English that the old Covenant is no longer in effect, But it is done away with, And the New Covenant that Jesus brought is now in effect. On the positive side, The disciples used the Lord's Day as the Sabbath in the day to get together, Do no work, But instead of Worship the Lord and have fellowship with one another. We know Jesus rose on the first day of the week which is Sunday. Throughout the Bible, Book of Acts, The writings of Paul, In the Book of Revelation we see the disciples getting together resting on this first day of the week, Sunday, Which they called the Lord's Day.