Izzy, in the NT, they used in the original Greek, a few words of Aramaic, but were sure to translate them: the original aramaic words have come down intact, but the translations might be incorrect. Eg, John translates “Rabbi” as “Master”, which perhaps has an incorrect connotation.
As for whether JC actually SAID he was the Messiah, it differs per Gospel. In Matthew, there is no such out & out statement, at least to the public, in John (witten much later), there is. Of, course, I am not implying that those Jews who accept JC as the Messiah would not be a sect, and a rather radical sect, but those Lubavichers who still believe their Rabbi was the Messiah are still considered members of a JEWISH sect, even tho misguided.
The Christians have separated out a few lines in the OT which imply a “second coming”, do you want me to ferret out & quote them? And by the way, the above “discussion” was very interesting, even to us Goyim.
So let’s see if I have this clear: A rabbi has to be ordained, except when he doesn’t; he is not needed to perform ceremonies/sacraments, except when he is; anyone an do the ceremonies, except when they can’t; a Kohan is a priest, except when he’s isn’t; and a rabbi is not a minister, except when he is. I’m clear.