Midrash su Genesi 49:5

Then defilest thou it—he went up to my couch (ibid. 49:4).¹⁵He slept with Bilah, his father’s concubine. He went up implies that you will be rejected until Moses appears, concerning whom it is written: And Moses went up unto God (Exod. 19:3), and he shall come, and intercede for you, saying: Let Reuben live, and not die (Deut. 33:6). And Reuben went out downcast. And he (Jacob) began to call out: Simeon and Levi are brothers (Gen. 49:5). They had acted as brothers toward Dinah but not toward Joseph, whom they had sold.

[Another interpretation (of Gen. 49:4): UNSTABLE AS WATER.] Our masters have taught (in Ter. 8:4): THREE LIQUIDS BECOME FORBIDDEN THROUGH BEING UNCOVERED: WATER, WINE, AND MILK. If wine is found uncovered, then one is sorry about it when he pours it out; but in the case of water, if it is found uncovered, one is not sorry for it if he pours it out. So you have done with all the crowns which belonged to me. You have thrown them away AS WATER. < You are as > UNSTABLE AS WATER. When Simeon and Levi came in to Jacob, he reproached⁵⁷Gk.: kentroun, i.e., “to strike with a goad.” them. He said (in Gen. 49:5): SIMEON AND LEVI ARE BROTHERS, WEAPONS OF VIOLENCE ARE THEIR MEKHEROT⁵⁸The meaning of this word is obscure, but the singular, mekherah, resembles the Greek machaira, which means “sword”; and such a meaning fits the context of the midrash. So Tanh., Gen. 12:9; Gen. R. 99 (another version):7 (= p. 1278 in the Theodor-Albeck edition); PRE 38 (in the Amsterdam and Prague editions). The Greek parallel to such an ancient Hebrew word may be due to the fact that swords were common objects of trade. What are MEKHEROT? WEAPONS OF VIOLENCE.

Simeon and Levi were moved by a great zeal on account of the immorality, as it is said, "And they said, Should he deal with our sister as with an harlot?" (Gen. 34:31). And each man took his sword and slew all the men of Shechem. When Jacob heard thereof, he became sorely afraid. For he said: Now all the people of the land will hear, and they will gather together against me || and smite me. He began to curse the wrath of his sons, as it is said, "Cursed be their anger, for it is fierce" (Gen. 49:7); and he also cursed their sword in the Greek language, for he said: "Weapons of violence are their swords" (Gen. 49:5). All the kings of the earth heard (thereof) and feared very much, saying: If two sons of Jacob have done all these great things, if they all band themselves together, they will be able to destroy the world. And the dread of the Holy One, blessed be He, fell upon them, as it is said, "And the terror of God was upon the cities,… and they did not pursue after the sons of Jacob" (Gen. 35:5).