Midrasch zu Tehillim 68:2

Three words in this one verse are expressions of pleading, humility, and meekness. The wicked one, however, said merely: Let my father arise, and eat. The Holy One, blessed be He, said to Jacob: Inasmuch as you said Arise, I pray thee, your descendant Moses will say to Me: Rise up, O Lord, and let thine enemies be scattered (Num. 10:35). Inasmuch as you said sit (shevah), your descendants will say: Return (shuvah), O Lord, unto the tens of thousands (ibid., v. 36). However, because Esau said Let my father arise, I will exact retribution from him through that very expression, as it is said: Let God arise, let His enemies be scattered (Ps. 68:2). Let my father arise. At that moment Isaac recognized his voice and began to tremble. Who art thou? (Gen. 27:32), he asked. When Jacob entered the room, a fragrance from the Garden of Eden accompanied him; a fragrance so pleasant that the righteous one’s mind was set at ease, as is said: See, the smell of my son is as the smell of a field which the Lord hath blessed (ibid., v. 27). However, when Esau entered, Gehenna was revealed to him. Hence, it says: Isaac trembled very exceedingly (ibid., v. 33). Isaac was astonished and cried out: I see Gehenna and Esau is causing the flames to rise.