יַ֤פְתְּ אֱלֹהִים֙ לְיֶ֔פֶת וְיִשְׁכֹּ֖ן בְּאָֽהֳלֵי־שֵׁ֑ם וִיהִ֥י כְנַ֖עַן עֶ֥בֶד לָֽמוֹ׃
하나님이 야벳을 창대케하사 셈의 장막에 거하게 하시고 가나안은 그의 종이 되게 하시기를 원하노라 하였더라
Rashi on Genesis
יפת אלהים ליפת MAY GOD ENLARGE JAPHETH — The Targum renders the verb by יפתי meaning, “may He extend”.
Sforno on Genesis
באהלי שם, (the plural mode) is a reference to Torah academies in addition to the Temple.
Radak on Genesis
יפת אלוקים, this expression is appropriately translated as “may He expand,” the root of the word יפת being פתח, an opening. It is in the transitive mode, as for instance Isaiah 41,2 ומלכים ירד, from the root רדה “to rule.” Noach prays that Yaphet’s share of the earth will be enlarged. Even though Noach promises quantity to Yaphet, he reserves quality for Shem, saying that G’d will make His home in the portion of the earth allocated to Shem’s descendants. (see Exodus 29,45) Moses also specifically prays for a renewal of this blessing after the sin of the golden calf in Exodus 33,16) when he pleads for the Jewish people to enjoy this distinction.