There are presently 28 separate Hebrew MS of Matthew, most of which contain cogent statements that conform to the culture of first century Jerusalem, and which also agree with the Siriac Aramaic NT, which pre-dates any existing Greek translation MS.
The study that I posted focuses on the plethora of obvious errors in the Greek MS and all codices derived therefrom.
The simple and obvious fact is that the Greek based texts are the strongest evidence there is against their own authenticity. None of the existing Shemetic texts contain those errors, thus testifying to a far greater reliability.
Unfortunately no large publishing house wishes to bring existing Hebrew nor Aramaic Ms to the public, so one has to be content to search university archives to find them. Certain of the Hebrew Matthew copies have been published in limited quantities, but are hard to obtain.
As is noted in the study that I posted, the “Hebrew Roots” Bible has the English translation of an Aramaic version of the NT, but not all of it has an early pedigree, due to the limitations of the Syriac Canon.
The link to the site from which I purloined the study is below: (they have numerous resources at that site)
http://www.messianic-torah-truth-seeker.org/
http://www.messianic-torah-truth-seeker.org/Torah-Midrash/NT-is-Hebrew-orignin-or-not.html
Previously I did miss including such as Papias, where in what fragments of later copies of that man's scribblings remain, do bear quite early witness that the Gospel of Matthew at least, was written in Hebrew in it's original.
Now since that book was singled out, it does lead one to consider that other portions of the NT were quite possibly not, though that argument alone is something of argument from silence.
And from where did the Syriac 'canon' as you put it, arise? How would we know the pedigree? How to establish chain of custody for those works..?
Perhap you have contemplated these questions, I wouldn't know. But I do know that I'm no language expert.
But thank you for the considerate and rational reply. Much appreciated