Here is some screenshots from the documentary called The Way. Here is a description about it..

The Way is the story of countless believers around the world who’ve traded Easter ham for Passover lamb and Sunday church for Saturday Sabbath - all in an effort to live like the Savior. They’re holding every church tradition up against scripture and cutting away anything that doesn’t conform. In the process, they encounter resistance from a religious system two millennia in the making, and for the first time, learn what it’s like to be a “peculiar people.”

What I am posted below was a part of the research I did even before I saw the documentary.

First up from the council of Laodicea

Then in the below book, which I have seen myself in person

Then in this pamphlet...

Now again you are already keeping the Biblical Sabbath but I thought it might be a good idea to post this information anyways!