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>> “please provide anywhere in the NT, after Penetecost, where any Christian is shown keeping the 7th day sabbath or is commanded to keep the 7th day sabbath.” <<

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More twisting!

The sabbath was in effect from creation until Constantine.

It didn’t need to be reinstituted by Christ since he declared that he would neither add to nor take away from Torah. Christianity as from Christ and his apostles was merely a fulfilled continuance of YHWH’s commanded worship so the restored covenant church just continued with it until corruption set in.

All worship mentioned in the NT is Sabbath centered worship, and all kept the Lord’s appointed times without interruption. I challenge you to find any time where they didn’t. All “first day” worship ever mentioned was at Havdala, which was just a short time after sunset (on what you would call saturday night) That was when they “came together on the first day”.