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Are you reading the same Bible as others? There are many verses in Acts about the early church both Jew & Gentile in the church keeping the sabbath of the Lord. You are mistaken. There is no mention in the NT of Christians keeping the sabbath. There is mention of some apostles going to synagogue with Jews (See 1 Cor 9:20) to witness to them but do not confuse that as a Christian assembly.
Ceremonial laws were a shadow that points to Christ. Don't you know the Bible says Christ is our passover? If you observe parts of the Mosaic law, you will be condemned by the rest of the Mosaic law that you ignore (see James 2:10). According to Col 2:16 the Sabbath is also a shadow of things to come.
Sabbath is a sign of 3 things:- Creation, sanctification & redemption. Christ has brought us out of the bondage of sin. Without posting scripture this is just your opinion.
Ellen G. White, who is considered inspired by Seventh-day Adventists, said that the Pope changed the Sabbath in about 321 AD. Why do all Adventists today reject their inspired prophet and say the change of the Sabbath occurred in about 140 AD? If White was wrong about this, was she wrong when she traveled to heaven and saw the 4th commandment glowing brighter than all the rest?
Where do you get this info? It is not just Ellen White who says this, many non SDA as well. Not true. There is no historical record of any change from Sabbath to Sunday at 321 AD or 140 AD. It is a myth.The Didache"But every Lord’s day . . . gather yourselves together and break bread, and give thanksgiving after having confessed your transgressions, that your sacrifice may be pure. But let no one that is at variance with his fellow come together with you, until they be reconciled, that your sacrifice may not be profaned" (Didache 14 [A.D. 70]).
The Letter of Barnabas
"We keep the eighth day [Sunday] with joyfulness, the day also on which Jesus rose again from the dead" (Letter of Barnabas 15:6–8 [A.D. 74]).
Ignatius of Antioch
"[T]hose who were brought up in the ancient order of things [i.e. Jews] have come to the possession of a new hope, no longer observing the Sabbath, but living in the observance of the Lord’s day, on which also our life has sprung up again by him and by his death" (Letter to the Magnesians 8 [A.D. 110]).
Justin Martyr
"[W]e too would observe the fleshly circumcision, and the Sabbaths, and in short all the feasts, if we did not know for what reason they were enjoined [on] you—namely, on account of your transgressions and the hardness of your heart. . . . [H]ow is it, Trypho, that we would not observe those rites which do not harm us—I speak of fleshly circumcision and Sabbaths and feasts? . . . God enjoined you to keep the Sabbath, and imposed on you other precepts for a sign, as I have already said, on account of your unrighteousness and that of your fathers . . ." (Dialogue with Trypho the Jew 18, 21 [A.D. 155]).
"But Sunday is the day on which we all hold our common assembly, because it is the first day on which God, having wrought a change in the darkness and matter, made the world; and Jesus Christ our Savior on the same day rose from the dead" (First Apology 67 [A.D. 155]).
Tertullian
"[L]et him who contends that the Sabbath is still to be observed as a balm of salvation, and circumcision on the eighth day . . . teach us that, for the time past, righteous men kept the Sabbath or practiced circumcision, and were thus rendered ‘friends of God.’ For if circumcision purges a man, since God made Adam uncircumcised, why did he not circumcise him, even after his sinning, if circumcision purges? . . . Therefore, since God originated Adam uncircumcised and unobservant of the Sabbath, consequently his offspring also, Abel, offering him sacrifices, uncircumcised and unobservant of the Sabbath, was by him [God] commended [Gen. 4:1–7, Heb. 11:4]. . . . Noah also, uncircumcised—yes, and unobservant of the Sabbath—God freed from the deluge. For Enoch too, most righteous man, uncircumcised and unobservant of the Sabbath, he translated from this world, who did not first taste death in order that, being a candidate for eternal life, he might show us that we also may, without the burden of the law of Moses, please God" (An Answer to the Jews 2 [A.D. 203]).
The Didascalia
"The apostles further appointed: On the first day of the week let there be service, and the reading of the holy scriptures, and the oblation [sacrifice of the Mass], because on the first day of the week [i.e., Sunday] our Lord rose from the place of the dead, and on the first day of the week he arose upon the world, and on the first day of the week he ascended up to heaven, and on the first day of the week he will appear at last with the angels of heaven" (Didascalia 2 [A.D. 225]).
Origen
"Hence it is not possible that the [day of] rest after the Sabbath should have come into existence from the seventh [day] of our God. On the contrary, it is our Savior who, after the pattern of his own rest, caused us to be made in the likeness of his death, and hence also of his resurrection" (Commentary on John 2:28 [A.D. 229]).
Victorinus
"The sixth day [Friday] is called parasceve, that is to say, the preparation of the kingdom. . . . On this day also, on account of the passion of the Lord Jesus Christ, we make either a station to God or a fast. On the seventh day he rested from all his works, and blessed it, and sanctified it. On the former day we are accustomed to fast rigorously, that on the Lord’s day we may go forth to our bread with giving of thanks. And let the parasceve become a rigorous fast, lest we should appear to observe any Sabbath with the Jews . . . which Sabbath he [Christ] in his body abolished" (The Creation of the World [A.D. 300]).
Eusebius of Caesarea
"They [the early saints of the Old Testament] did not care about circumcision of the body, neither do we [Christians]. They did not care about observing Sabbaths, nor do we. They did not avoid certain kinds of food, neither did they regard the other distinctions which Moses first delivered to their posterity to be observed as symbols; nor do Christians of the present day do such things" (Church History 1:4:8 [A.D. 312]).
"[T]he day of his [Christ’s] light . . . was the day of his resurrection from the dead, which they say, as being the one and only truly holy day and the Lord’s day, is better than any number of days as we ordinarily understand them, and better than the days set apart by the Mosaic law for feasts, new moons, and Sabbaths, which the apostle [Paul] teaches are the shadow of days and not days in reality" (Proof of the Gospel 4:16:186 [A.D. 319]).