Salamun Alaikum Saleh,
It is highly probable that Prophet Jesus would have been multilingual given that he grew up in a region which was not only culturally but linguistically diverse. He would have most likely been familiar with the common language of Greece and Rome (Greek and Latin), Hebrew - the sacred tongue of Judaism and also Aramaic (regional dialect).
We know that Prophet Jesus spoke Aramaic due to phrases used by him in the New Testament in Greek.
For example: we note in Mark 15:34, Jesus to say: "Eloi Eloi lama sabachthani?" "My God, my God, why have you forsaken me?". This phrase is not a Greek phrase but one in Aramaic. A similar rendering is also present in the Gospel of Matthew (27:46).
We also note that Prophet Jesus was able to speak with Pontius Pilate (John 18:28-38). It is unlikely that the Romans would have been conversant with the language of the Jews. Therefore, it is more probable (unless a translator was present, but we have no Biblical indication of this) that the conversation may have ensued in Greek or Latin.
John 18:33
Then Pilate entered into the judgment hall again, and called Jesus, and said unto him, Art thou the King of the Jews?
John 18:34
Jesus answered him, Sayest thou this thing of thyself, or did others tell it thee of me?
John 18:35
Pilate answered, Am I a Jew? Thine own nation and the chief priests have delivered thee unto me: what hast thou done?
John 18:36
Jesus answered, My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews: but now is my kingdom not from hence.
John 18:37
Pilate therefore said unto him, Art thou a king then? Jesus answered, Thou sayest that I am a king. To this end was I born, and for this cause came I into the world, that I should bear witness unto the truth. Every one that is of the truth heareth my voice.
[King James Version]
With your second question regarding the Torah and Prophet Moses, there are many verses which make it absolutely clear that it could have only been the Torah that was revealed to Prophet Moses. Clearly the Jews were judged by the Torah (5:43), a scripture that was revealed to them (5:44) and examples within the Torah (Life for Life, eye for an eye etc) can be directly matched with the Torah given to Moses (5:45). [See Deuteronomy 19:21; Exodus 21:23-25 and Leviticus 24:18-20]. We also know that Prophet Moses was given scripture (6:91; 17:2).
I am not sure if you are looking for one specific verse.
As I am sure you will appreciate, viewing Quranic verses in isolation is not an approach substantiated by the Quran. Different parts of the scripture explain each other and must be studied as a collective whole.
039:023 (part)
"God has revealed the most beautiful message in the form of a Book consistent with itself yet repeating (its teaching in various aspects)..."
I hope this helps,
Regards,
Joseph.