25 The first came out reddish all over, like a hairy garment, so they named him Esau. 26 When his brother came out with his hand clutching Esau’s heel, they named him Jacob. Isaac was sixty years old when they were born. 27 When the boys grew up, Esau became a skilled hunter, a man of the open fields, but Jacob was an even-tempered man, living in tents. 28 Isaac loved Esau because he had a taste for fresh game, but Rebekah loved Jacob.

13 and [2046 A.M.] Jacob was a smooth and upright man, and Esau was fierce, a man of the field, and hairy, and Jacob dwelt in tents. 14 And the youths grew, and Jacob learned to write; but Esau did not learn, for he was a man of the field and a hunter, and he learnt war, and all his deeds were fierce. 15 And Abraham loved Jacob, but Isaac loved Esau.

..."...And the youths grew up" (Bereishit 25:27). Rabbi Levi made an analogy to a myrtle and wild rosebush which grew next to each other; when they had grown, one gave forth scent and the other thorns. So too with these, for thirteen years they both went to school (beit hasefer) and came back from school, but after thirteen years this one went to study-houses (batei midrashot) and this one went to idolatrous temples (batei avodat kochavim). Rabbi Elazar said, until thirteen years a person needs to take care of their children - from this age onwards, they need to say "Blessed is the one who has exempted me from the punishment of this one." "And Eisav was a man who knew how to hunt..." (ibid.) - he trapped people with his mouth; "you didn't steal?! Who stole with you? You didn't kill?! Who killed with you?" Rabbi Abahu said, robber [is the same as] hunter. He hunted in the house and in the field; in the house he said "How do you tithe salt?" and in the field "how do you tithe straw?" Rabbi Chiya said, he made himself ownerless like a field. Yisrael said before the Holy Blessed One, "Master of all universes: is it not enough for us that we are subjugated by the seventy nations - must we also be subjugated by this one, who is penetrated like women?" The Holy Blessed One said to them, "Even I will come in language [?], I will be revenged upon them." Behold it is written, "And the heart of the heroes of Edom was on that day like the heart of a woman in labour" (Yirmiyahu 49:22). "But Ya'akov was a simple man, a dweller in tents..." (Bereishit 25:27) - two tents, the study-house of Shem and the study-house of Ever. "And Yitzchak loved Eisav, for game was in his mouth..." (Bereishit 25:28) a good piece of meat for his mouth, a good cup of wine for his mouth. "And Rivka loved Ya'akov..." (ibid.) - every time she heard his voice she would add love to her love.