You're asking me which NT book was preached from on the day of an event you would not know about except for the NT book of Acts? Now THAT is irony :)
My point, friend, is that Scripture was Scripture long before the Church as an ecclesiastical institution formally recognized it as such. Those Scriptures were the ones that had been originally written to the various churches by the Apostles and were themselves held as authoritative.
Yes, exactly. Matthew was written by Matthew the Apostle. John was written by John the Apostle. Ditto the Epistles of Paul, Peter, and James.
But consider also that Luke was not written by an Apostle. Mark was not written by an Apostle. Is it not curious that an infallible book could be written by two men who were not themselves infallible? What gave these books any authority?
You seem not to realize that we Catholics [and here I'm including Orthodox in that term] were there on that day. We knew about it before it was written down. If the NT had not been written, it would have been passed down by the fathers.
My point, friend, is that Scripture was Scripture long before the Church as an ecclesiastical institution formally recognized it as such.
That is an entirely different claim. I agree with that claim. But that is completely different from your previous claim that "The Church did not give us the Scriptures, the Scriptures gave us the Church". Initially, on the day of Pentecost, the Apostles *were* the Church. Years later the Apostles wrote the NT Scriptures. Therefore the Church gave us the Scriptures. There was no such thing as 'sola scriptura' in the early Church because no NT books had even been written. See Sungenis's Not By Scripture Alone.
-A8