"And the boys grew up" (Genesis 25:27): Jacob walked in the way of life, for he dwelt in tents and occupied himself with Torah all his days; Esau in the way of death, for he killed Nimrod and Hivvar his son. And further he sought to kill Jacob, [saying] "let the days of mourning for my father draw near" (Genesis 27:41). Jacob served Abraham fifteen years, and Shem fifty-eight years; Shem served Methuselah ninety-eight years, and so forth. "Jacob was a wholesome man": he was born circumcised (as is written in remez 16).
Jacob Walked the Road of Life and Esau the Road of Death
Yalkut Shimoni on Torah 110:29
וַיִּגְדְּלוּ הַנְּעָרִים, יַעֲקֹב הָלַךְ בְּדֶרֶךְ הַחַיִּים, שֶׁהָיָה יוֹשֵׁב אֹהָלִים וְעוֹסֵק בְּתוֹרָה כָּל יָמָיו, עֵשָׂו בְּדֶרֶךְ הַמָּוֶת, שֶׁהָרַג אֶת נִמְרוֹד וְאֶת חִיוָר בְּנוֹ. וְעוֹד בִּקֵּשׁ לַהֲרוֹג אֶת יַעֲקֹב, "יִקְרְבוּ יְמֵי אֵבֶל אָבִי". יַעֲקֹב שִׁמֵּשׁ אֶת אַבְרָהָם חָמֵשׁ עֶשְׂרֵה שָׁנָה וְאֶת שֵׁם חֲמִשִּׁים וּשְׁמוֹנָה שָׁנָה שִׁמֵּשׁ שֵׁם אֶת מְתוּשֶׁלַח תִּשְׁעִים וּשְׁמוֹנָה וְכוּ'. יַעֲקֹב אִישׁ תָּם, נוֹלַד מָהוּל, (כִּדְכָתוּב בְּרֶמֶז י"ו).