“ This was a signal that he [Yosef] will be the leader in the field and in the house, as in the matter of "and I will dress him in your tunic" (Isaiah 22:21) , and this is like our sages, of blessed memory, said (Bava Kama 11a) , "the eldest of the heirs, as it is in the interest of them all that his words should be respected." לְאות שֶׁיִּהְיֶה הוּא הַמַּנְהִיג בַּבַּיִת וּבַשָּׂדֶה, כְּעִנְיָן "וְהִלְבַּשְׁתִּיו כֻּתָּנְתֶּךָ" (ישעיהו כב, כא) , וּכְאָמְרָם זִכְרונָם לִבְרָכָה: "בִּגְדול אֲחֵי כִּי הֵיכִי דְּלִשְׁתַּמְעָן מִלֵּיהּ" (בבא קמא יא, ב) . ”

“ All of this [extra attention to Joseph] caused jealousy [between the other sons of Jacob] . כל זה גרם הקנאה. a son of old age בֶן־זְקֻנִ֥ים
He was the last born of his [Jacob’s] eleven boys [other than Benjamin] , but Benjamin was not born until long after and [this occurred] long before Benjamin was born, so he [Joseph] was "the child of his old age" and [Jacob] began to love him [the most] . כי אחרון היה לי"א בנים, אבל בנימין לא נולד אחרי כן עד זמן מרובה והרבה קודם שנולד בנימין, היה לו בן זקונים והתחיל לאוהבו. ”