וַיַּ֛עַן יִצְחָ֥ק אָבִ֖יו וַיֹּ֣אמֶר אֵלָ֑יו הִנֵּ֞ה מִשְׁמַנֵּ֤י הָאָ֙רֶץ֙ יִהְיֶ֣ה מֽוֹשָׁבֶ֔ךָ וּמִטַּ֥ל הַשָּׁמַ֖יִם מֵעָֽל׃
At sumagot si Isaac na kanyang ama at sinabi sa kanya: “Narito, sa matatabang bahagi ng lupa ang magiging tahanan mo, at sa hamog ng langit mula sa itaas.
Rashi
משמני הארץ וגו THE FATNESS OF THE EARTH etc. — This refers to the Greek portions of Italy (Graeca Magna) (Genesis Rabbah 67:6).
Alshekh
Eisov raised his voice and wept. He realized that the blessings were in Hashem’s hands, not his father’s, so he cried out to Him and was answered, illustrating that the Gates of Tears are never locked.
Chizkuni
הנה משמני הארץ, “from the best parts of the land of Canaan will be your personal home;” a reign of the Holy Land is as the best parts and sweets of the Land [Yitzchok referred to the region known as har seir, which adjoins the ancestral region settled by the tribe of Yehudah, a very fruitful region and irrigated from the heavenly dews no less than the Holy Land itself. How did Yitzchok know that G-d approved of the blessing he just pronounced? The reader is referred to Joshua 24,4].