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>> “I understand the Apostles met on Sunday, the first day of the week” <<
That is definitely not what the word says.
The places where coming together on the first day of the week are mentioned, it is for the purpose of bringing money, which is forbidden to be carried on the Sabbath.
The Acts makes it plain that all worshipful gatherings were on “every Sabbath day.”
Everything in the Acts is clearly centered on adherence to Torah.
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Saturday is never mentioned as the Sabbath. The SDA’s only use Fri night/Saturday because modern Jews use it.