וַיִּשְׂטֹ֤ם עֵשָׂו֙ אֶֽת־יַעֲקֹ֔ב עַל־הַ֨בְּרָכָ֔ה אֲשֶׁ֥ר בֵּרֲכ֖וֹ אָבִ֑יו וַיֹּ֨אמֶר עֵשָׂ֜ו בְּלִבּ֗וֹ יִקְרְבוּ֙ יְמֵי֙ אֵ֣בֶל אָבִ֔י וְאַֽהַרְגָ֖ה אֶת־יַעֲקֹ֥ב אָחִֽי׃
און עֵשָׂו האָט פֿײַנט געקריגן יעקבן איבער דער ברכה װאָס זײַן פֿאָטער האָט אים געבענטשט, און עֵשָׂו האָט געזאָגט בײַ זיך אין האַרצן: זאָלן אָנקומען די טרױערטעג נאָך מײַן פֿאָטער, און איך װעל הרגען מײַן ברודער יעקבן.
Jerusalem Talmud Avodah Zarah
“Saturnalia,” “hidden hatred; hating, taking revenge, preserving [hatred].98A proposed Hebrew etymology of “Saturnalia.”” This is what you say, Esau hated Jacob99Gen. 27:41.. Rebbi Isaac ben Rebbi Eleazar said, in Rome they call it “senate of Esau100In Gen. rabba66(7) there is a different, more intelligible version: Esau hated Jacob; R. Eleazar ben R. Yose said, he was his steward (סַנְטֻרוי) but became hating, taking revenge, preserving [hatred]; for this one calls the Senators (סֶנָטֹרוי) of Rome. For סנטר saltuarius cf. Bava mesi‘a5:7 Note 138..”
Berakhot
"Reuben" — [what means "Reuben"]? R. Eleazar answered : Leah said, "See the difference between my son and the son of my father-in-law ; for the son of my father-in-law, although he voluntarily sold his birthright — as it is written, 'And he sold his birthright unto Jacob' (ibid. xxv. 33) — see what is written of him, 'And Esau hated Jacob' (ibid, xxvii. 41)