יַ֤פְתְּ אֱלֹהִים֙ לְיֶ֔פֶת וְיִשְׁכֹּ֖ן בְּאָֽהֳלֵי־שֵׁ֑ם וִיהִ֥י כְנַ֖עַן עֶ֥בֶד לָֽמוֹ׃
Бог увеличит Иафета, и он будет жить в шатрах Симовых; И пусть Ханаан будет их слугой.
Bartenura
יונית כתוב עליהן – they were accustomed to do it in Greek because it is written (Genesis 9:27): “May God enlarge Japheth, and let him dwell in the tents of Shem.” The beauty of Japheth will dwell in the tents of Shem [Megillah 9a], and the language of “beauty” in the children of Japheth does not exist other than in the Greek language.
Sforno
!מה טובו אהליך יעקב; a reference to the Torah academies. [the word אהל in that sense dates back to Genesis 25,27 where Yaakov is described as יושב אהלים a dweller in tents.” It was also used in this sense by Noach when he blessed his son Shem (Genesis 9,27) We find it even more prominently as possessing this meaning in Exodus 33,7 “anyone desirous of finding the presence of G’d would go out to the Tent of Testimony.”
Bartenura
אין נכתבין אלא יונית – And the reason that they permitted scrolls in Greek more than other language, as it says in the Bible (Genesis 9:27): “May God enlarge Japheth, and let him dwell in the tents of Shem…” The beauty of Japheth, that is, the beautiful language of Japheth [that is found] among all of the children of Japheth, “let him dwell in the tents of Shem,” and there is no more beautiful language among all of the children of Japheth like the Greek language. And the Halakha is like Rabban Shimon ben Gamaliel. However, at this time, that Greek language has become lost and confounded. Therefore, at this time, we do not write scrolls other than in the Holy Writing and in the Holy Language.