Midrash su Genesi 18:18

Now Jacob saw that there was grain in Egypt (Gen. 42:1). Scripture says elsewhere in allusion to this verse: I have been young, and now am old; yet have I not seen the righteous forsaken, nor his seed begging bread (Ps. 37:25). R. Samuel the son of Nahman said: This verse was spoken by the Prince of the Universe.³God appointed Enoch the prince of angels. See Ginzberg, Legends of the Jews 1:129. I have been young: from the time of Adam; Now am old: until the days of the Messiah; yet have I not seen indicates that there is no time in which the Holy One, blessed be He, permits the world to be without righteous ones. In fact righteous men appear in every generation, as R. Tanhuma explained in the name of R. Aha: The world never lacks thirty men as righteous as Abraham, as it is said: And Abraham shall surely become a great nation (Gen. 18:18). The numerical value of the Hebrew letters of the word shall become (yihyeh) adds up to thirty.

R. Levi said: He is the one concerning whom the Holy One, blessed be He, said: All the nations of the earth shall be blessed through him (Gen. 18:18). During the generation of the separation, the sea inundated the world and the descendants of Ham were scattered (as thirty families), as it is said: The Lord scattered them abroad (Gen. 11:8). But now, the Holy One, blessed be He, said to him: I will cause them to descend from you, as it is said: All the nations of the earth will be blessed through him. He begot the (thirty) families, and these are they: the twelve princes that descended from Ishmael (ibid. 25:12—16), the sixteen offspring from his wife Keturah (ibid., vv. 1—4), and the two nations in the womb of Rebecca (ibid., v. 23). Hence Scripture says: All the nations of the earth will be blessed through him.

R. Jassi, chancing to meet Elijah, asked him: "It is written, I will make him a help. Wherewith does a woman help the man?" He said to him: "A man brings in wheat; can he eat wheat? He brings flax; can he cloth himself with flax? Does this not consequently prove that she enlightens his eyes and puts him on his feet?" R. Elazar said further: "What does the passage, (Ib.) This time it is bone of my bones, and flesh of my flesh, mean? We can infer from this that Adam did not find life satisfied until Eve was brought to him." R. Elazar said further: "What does the passage (Ib. 12, 3) And in thee shall all families of the earth be blessed, mean? The Holy One, praised be He: said unto Abraham: 'Two good shoots have I to protrude from thee, Ruth the Moabite and Na'amah the Ammonite. All families of the earth; i.e., even such families as are living on farms would not have been blessed if it were not for Israel's sake.'" (Ib. 18, 18) All the nations of the earth; i.e., even the ships going from Gaul to Spain would not have been blessed [with success] if it were not for Israel's sake.