Midrash su Genesi 27:23

Make yourself an ark of acacia-wood (Gen. 6:14). R. Huna said in the name of R. Yosé: The Holy One, blessed be He, forewarned the generation of the flood to repent its misdeeds for one hundred and twenty years.¹¹This number is derived from And therefore shall his days be one hundred and twenty years (Gen. 6:3). When they refused to repent, He commanded Noah to build an ark of acacia-wood. Then Noah arose, repented his sins, and planted cedar trees. They asked him: “What are these cedars for?” “The Holy One, blessed be He, intends to bring a flood upon the earth, and He has ordered me to build an ark so that I and my family might escape,” he replied. They laughed at him and ridiculed his words. Nevertheless, he tended the trees till they grew large. Once again they asked him: “What are you doing?” He repeated what he had told them previously, but they continued to mock him. After some time, he cut down the trees and sawed them into lumber. Again they inquired: “What are you doing?” He warned them once again as to what would happen, but they still refused to repent. Thereupon the Holy One, blessed be He, brought the flood upon them, as it is said: And they were blotted out from the earth (Gen. 7:23).

(Gen. 27:23:) SO HE DID NOT RECOGNIZE HIM BECAUSE HIS HANDS WERE < HAIRY LIKE THE HANDS OF HIS BROTHER ESAU >. He (Isaac) foresaw that the wicked ones were going to arise from him; and he did not want to bless him {since he foresaw Jakum.⁴³I.e., Jakum of Seroroth. See Gen. R. 65:22; cf. M. Ps. 11:7. When Jerusalem was conquered, the world said: They are afraid to enter into the Temple. What did he do? He entered and brought < out > the menorah. When < Isaac > saw him, he did not want to bless Jacob on his account. SO HE DID NOT RECOGNIZE HIM}. When he foresaw that he would repent, there immediately follows (in vs. 27): THEN HE SMELLED THE ODOR OF HIS CLOTHES AND BLESSED HIM…. When Jacob entered, the Garden of Eden (i.e., Paradise) entered with him, as stated (ibid., cont.): LIKE THE ODOR OF A FIELD WHICH THE LORD HAS BLESSED. When Esau entered, Gehinnom entered with him. Thus it is stated (in vs. 33): WHO IS EPHO?⁴⁴The natural translation is: WHO THEN? Now EPHO can only be Gehinnom, since it is stated (in Is. 22:16): THAT YOU HAVE HEWN A TOMB HERE (poh) FOR YOURSELF.