Q: Dear brother, Where is in the bible, that Sabbath keeping change to Sunday keeping. Under whose authority is this change. Thank you. God bless.
A:  Here’s our article on the issue published a couple of years ago:
Sunday or Sabbath Worship?
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Q: Why do Christians follow Roman man-made traditions and worship on Sundays? After all, Saturday is the real Sabbath.
A: In truth, every day is a good and proper day to worship our God. Nevertheless, Sunday gradually replaced Saturday as the major day of worship for most Christians: [...]