Kabbalah su Genesi 27:40

"Be lord over your brethren" (Beresheet 27:29). Why Heveh (be), instead of the more accepted Heyeh or Tih'yeh? This is a supernal mystery of faith, for these letters, HEI-VAV-HEI are mysteries of faith. The upper Hei above (Binah), Vav in the middle (Tiferet), and the last Hei (Malchut). Therefore he said "Heveh (be) a lord over your brethren," rule over them, and govern them, when king David will appear. Rabbi Yosi said that all that will happen when Messiah will come. For (as long as) Yisrael transgress the words of the Torah, then, "you shall break his yoke from off your neck"

Also, Jacob (was blessed) above and below. And Esau only below. And though it is written, "and it shall come to pass when you shall have the dominion, that you shall break his yoke from off your neck" (Beresheet 27:40), here, but up above, nothing (is cancelled), as it is written, "For Hashem's portion is his people, Jacob is the lot of His inheritance" (Devarim 32:9). Come and behold, When Jacob and Esau started to avail themselves of the blessings, Jacob received his share from above, and Esau took his share below.

"Behold, I have made him your lord...and what shall I do now for you, my son" (Beresheet 27:37). This means that there is no one present who gives consent, "What shall I do now for you, my son." He then blessed him in this world. He looked at his grade and said to him "and by your sword shall you live," for it is fitting of you to shed blood and wage wars. Therefore he said, "What shall I do now for you, my son".