IB] read one scripture, on one occasion in which Paul gathered to preach on Sunday:
(Act 20:7) And upon the first day of the week, when the disciples came together to break bread, Paul preached unto them, ready to depart on the morrow; and continued his speech until midnight.
Then I read the following verses in Acts where Paul preached on the Sabbath/Saturday:
(Act 18:4) And he reasoned in the synagogue every sabbath, and persuaded the Jews and the Greeks.
(Act 17:2) And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the scriptures,
The evidence of the Bible strongly indicates that the Sabbath/Saturday was the day of worship.
written with love
(Act 13:14) But when they departed from Perga, they came to Antioch in Pisidia, and went into the synagogue on the sabbath day, and sat down.
(Act 13:44) And the next sabbath day came almost the whole city together to hear the word of God.
(Act 13:45) But when the Jews saw the multitudes, they were filled with envy, and spake against those things which were spoken by Paul, contradicting and blaspheming.
(Act 16:13) And on the sabbath we went out of the city by a river side, where prayer was wont to be made; and we sat down, and spake unto the women which resorted thither.
Let me ask you a question:
If you wanted to convert Catholics, and you know they went to worship on Sundays, would you try to talk to them on a Monday, Saturday, Friday? Or would you rather maximize your time effort and go talk to them on Sundays, after Mass?
Paul, in wanting to convert Jews, would of course do it on the day of Jewish worship, where he could reach the widest audience. He was being smart, wasn’t he.
But, as you quoted in Acts 20, he broke bread, meaning went to worship or went to Mass, the new form of worship, with the Apostles on sunday.