"We keep the eighth day [Sunday] with joyfulness, the day also on which Jesus rose again from the dead" (The Epistle of Barnabas, AD100).
Nice try, but I actually know what eighth day theology is. Quoting some first century Hellenist of the order of Plato keeping the 8th day in honor of the pleroma is not exactly convincing. This is a very early spiritual adultery - mixing pagan with true worship. The Catholics still have the nerve to call it the eighth day.
nouveau theologies such as that put forward by groups like the SDA, Messianic Judaism, etc cannot change the truth of the word of God. They are the ones in confusion who attempt to change His word to suit these theologies.
Alas, we Sabbatarians are striving to live a coherent Biblical life. We tend to put scripture over tradition so much that it makes life inconvenient. Have you ever tried to buy a car on Sunday? For the most part, we weight our theology heavily on the following verse:
Rev 12:17 And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.
Our faith is linear from Genesis to Revelation. We do not dispense with any parts of the Bible. Sola Scriptura indeed.
My prayer for you is that one day you will see that too.
Been there, done that. Protestantism and Romanism are very conflicted theologies, IMO.
"Likewise you shall do with your oxen and your sheep. It shall be with its mother seven days; on the eighth day you shall give it to Me." (Exo. 22:30)
"Also on the fifteenth day of the seventh month, when you have gathered in the fruit of the land, you shall keep the feast of the Lord for seven days; on the first day there shall be a sabbath-rest, and on the eighth day a sabbath-rest." (Lev. 23:39)
"'When these days are over it shall be, on the eighth day and thereafter, that the priests shall offer your burnt offerings and your peace offerings on the altar; and I will accept you,' says the Lord God." (Eze. 43:27)
All these OT "eighth day" verses point to the work of Christ, completed on the "eighth day" when He rose from the dead.
Sola Scriptura indeed.
Except you have failed to deal with this matter sola Scriptura. Just try exegeting Luke 24 and get us to a Saturday resurrection. It cannot happen.
"Now when He rose early on the first day of the week, He appeared first to Mary Magdalene, out of whom He had cast seven demons." (MArk 16:9)