Midrash su Ezechiele 47:6

"These are the words" - Halakhah: Is a Jewish person permitted to write a Torah scroll in any language? This is what the Sages taught: The only difference between scrolls and Tefillin or Mezuzot is that scrolls may be written in any language. Rabban Gamliel says: One is not even permitted for scrolls unless they are written in Greek. What is Rabban Gamliel's reasoning that one it is permissible to write a Torah scroll in Greek? This is how our Rabbis taught: Bar Kappara said: It is written, "May God extend Yephet, may he dwell in the tents of Shem," (Gen. 9:27) that the words of Shem may be spoken in the language of Yephet - therefore it is permitted that they be written in the Greek language. The Holy Blessed One said: See how the language of the Torah is so dear that it heals the tongue! From where do we know this? Since it is written, "A healing tongue is a tree of life," (Pro. 15:4) and the "tree of life" only refers to the Torah, as it is said, "it is a tree of life to those who grasp onto her," (Pro. 3:18). The language of the Torah makes the tongue fluent.