Are you aware that the Sabbath will be kept in the Millenia and beyond? Are you aware that any Apostle or Disciple who espoused breaking God's Law would have been stoned or disfellowshipped? Are you aware that Jesus went to great lengths to show His follows how to keep the Sabbath? Are you aware that the Pharisees and Saducces were trying to kill Jesus by getting him to heal on the Sabbath and using the Law (Deuteronomy 13:1-5)?
I'm afraid that the position Protestantism is revisionist. I searched that Bible for justification for the keeping of Study and came up woefully short. If you could provide me with a scripture or two that I missed that repeals the Sabbath, or any of God's Laws, I would appreciate it.
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So it appears that we agree that the apostles and disciples did get together to observe the Sabbath on Saturdays.
What you don't acknowledge is that they then got together on Sundays to observe the new Christianity because Christ rose from the dead on a Sunday -- the third day after his death on the Cross.