In what languages were all the heavenly books i.e. Torah , Zabur , Injil and Quran revealed?
The Qur'an informs us that God sent prophets the people who spoke to them in their own language.
وَمَا أَرْسَلْنَا مِن رَّسُولٍ إِلَّا بِلِسَانِ قَوْمِهِ لِيُبَيِّنَ لَهُمْ
And We have not sent any messenger except in the language of his people, that he may explain matters to them. (14:4)
Therefore, all the divine revelations were revealed in the languages that the people of the time spoke. Based on this we conclude that the Torah and the Zabur were revealed in the Hebrew language because they were revealed to the children of Israel who spoke Hebrew. Even today the existent Torah and Zabur are in Hebrew. In their later period, the Jews began to converse in Greek rather than in Hebrew. Therefore, in mid 3rd century BCE, the Jewish scriptures were translated into Greek by 72 scholars and this became known as the 'Septuagint'.
In the case of the Injil, Jesus (pbuh), his disciples and the Jewish population spoke Aramaic and so he must have delivered the divine message of the Injil to them in this very language. However, he did not get an opportunity to put it down in writing as he faced severe opposition from the Jews. The injil was subsequently put to writing by different authors many years after Jesus (pbuh) in Greek, which was the widely spoken language in the Roman Empire at that time. The word 'Injil' is itself the Arabized version of the Greek word 'Evangelion' meaning 'Good News'.
The Qur'an, as we know, was revealed in Arabic. There is no doubt about this.
Hope this helps.