ויגוע יצחק. אֵין מֻקְדָּם וּמְאֻחָר בַּתּוֹרָה; מְכִירָתוֹ שֶׁל יוֹסֵף קָדְמָה לְמִיתָתוֹ שֶׁל יִצְחָק י"ב שָׁנָה, שֶׁהֲרֵי כְּשֶׁנּוֹלַד יַעֲקֹב הָיָה יִצְחָק בֶּן שִׁשִּׁים שָׁנָה, שֶׁנֶּאֱמַר וְיִצְחָק בֶּן שִׁשִּׁים שָׁנָה וְגוֹ', וְיִצְחָק מֵת בִּשְׁנַת ק"כ לְיַעֲקֹב – אִם תּוֹצִיא שִׁשִּׁים מִמֵּאָה וּשְׁמוֹנִים שָׁנָה נִשְׁאֲרוּ ק"כ – וְיוֹסֵף נִמְכַּר בֶּן י"ז שָׁנָה, וְאוֹתָהּ שָׁנָה שְׁנַת מֵאָה וּשְׁמוֹנֶה לְיַעֲקֹב, כֵּיצַד? בֶּן שִׁשִּׁים וְשָׁלוֹשׁ נִתְבָּרֵךְ, אַרְבַּע עֶשְׂרֵה שָׁנָה נִטְמַן בְּבֵית עֵבֶר, הֲרֵי שִׁבְעִים וְשֶׁבַע, וְאַרְבַּע עֶשְׂרֵה עָבַד בְּאִשָּׁה, וּבְסוֹף אַרְבַּע עֶשְׂרֵה נוֹלַד יוֹסֵף, שֶׁנֶּאֱמַר וַיְהִי כַּאֲשֶׁר יָלְדָה רָחֵל אֶת יוֹסֵף וְגוֹ', הֲרֵי תִּשְׁעִים וְאַחַת, וְי"ז עַד שֶׁלֹּא נִמְכַּר יוֹסֵף, הֲרֵי מֵאָה וּשְׁמוֹנֶה (עוֹד מְפֹרָשׁ מִן הַמִּקְרָא מִשֶּׁנִּמְכַּר יוֹסֵף עַד שֶׁבָּא יַעֲקֹב מִצְרַיִמָה כ"ב שָׁנָה שֶׁנֶּ', וְיוֹסֵף בֶּן שְׁלֹשִׁים שָׁנָה וְגוֹ', וְז' שָׁנִים שָׂבָע וּשְׁנָתַיִם רָעָב, הֲרֵי כ"ב, וּכְתִיב יְמֵי שְׁנֵי מְגוּרַי שְׁלֹשִׁים וּמְאַת שָׁנָה, נִמְצָא יַעֲקֹב בִּמְכִירָתוֹ ק"ח):
ויגוע יצחק AND ISAAC EXPIRED — There is no such thing as “earlier’’ or “later” (chronological order) in the narratives of the Torah (Pesachim 6b), and the sale of Joseph preceded Isaac’s death by twelve years. Thus: at Jacob’s birth Isaac was sixty years old — as it is said (25:26) “And Isaac was sixty years old [when he bore them]” (Esau and Jacob). Isaac died when Jacob was 120, for if you deduct 60 from 180 (Isaac’s age when he died), you have left 120. Joseph was 17 years old when he was sold, and that year was the one hundred and eighth of Jacob’s life. How is this? Jacob was 63 when he received the blessing of his father; 14 years he hid himself in Eber’s School — making 77 — and 14 years “he served for his wives” (Rashi borrows a phrase from Hosea 12:13 “And Israel served for a wife”; but he means for both wives), and at the expiration of these 14 years Joseph was born as it is said (30:25) “and it came to pass when Rachel had born Joseph” (that Jacob wished to return home and he would not have desired to do this if his fourteen years of service were not completed) making 91. Add to this the seventeen years of Joseph’s life before he was sold, and you have 108. This may also be derived more directly from Scripture thus: from the time when Joseph was sold until the time when Jacob came to Egypt was 22 years, for it is said (41:46) “And Joseph was 30 years old [when he stood before Pharaoh]” (and therefore he had been in Egypt 13 years, as he was 17 when he was sold) and the seven years of plenty and two of famine had elapsed before Jacob came to Egypt (cf. 45:6), making 22 years. And as it is written (47:9) that Jacob on his arrival in Egypt said to Pharaoh “The days of the years of my sojournings are a hundred and thirty years”, it follows that at the time when Joseph was sold Jacob was one hundred and eight years old.