Thus says the rabbis. As I have poined out before, it does not say, they were gathered for the Jewish last day sabbath and then hung around for a Jewish fellowship meal. It says, "The came together on the first day of the week to break bread," etc. There is absolutely no mention of any last day sabbath worship in the context. All the worship happened entirely on the first day of the week.
There is no mention of worship here....only eating a meal and they came together on the FIRST of the week. It does not say first day!