The word "slave" is incorrect. The word always was servant.

I thought this important to show corruption in modern bibles. Here is yet another example that should be scrutinized.
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Context:
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This is Part 2 of Reg's critique of John MacArthur's understanding of the history of the church regarding translating "doulos" servant, not slave. He quotes references to Polycarp, Iranaeus and other early church leaders who all regarded themselves as servants, not slaves. He also quotes Reformation Bibles that all translated doulos as servant, not slave. Were they all mistaken? Was the church wrong for the past 2000 years?
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https://www.youtube.com/watch?v=6C5tjb1pAMI
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A repost from a while back but valuable.