Midrash su Isaia 11:13

Then Judah came near unto him (Gen. 44:18). Scripture states elsewhere in reference to this verse: And the envy of Ephraim shall depart (Isa. 11:13). Concerning whom did Isaiah utter this verse? He said it with reference to Judah and Joseph.

And he sent Judah before him (Gen. 46:28). Scripture states elsewhere in reference to this verse: The envy also of Ephraim shall depart … Ephraim shall not envy Judah (Isa. 11:13). Jacob our patriarch sent Judah before him because he believed that Judah had killed Joseph at the time he brought him the coat of many colors, as it is said: And he knew it, and said: “It is my son’s coat; an evil beast hath devoured him” (Gen. 37:33). An evil beast refers to Judah, since it is said: Judah is a lion’s whelp. And Jacob said to Judah: “Thou art the one who hath rent him asunder.” Whereupon Jacob rent his garments … and all his sons and daughters rose up to comfort him (ibid., vv. 34–35).

And Judah saw there a daughter of a certain Canaanite (ibid. 38:2). She bore him two sons, Er and Onan, and both of them died. During the years in which Joseph was separated from his father, Jacob was convinced that Judah had killed him. Whence do you learn this? From the episode dealing with Benjamin: Whereas Judah said to Joseph: “For thy servant is surety for the youth” (ibid. 44:32). It was only after he announced that he had pledged himself for Benjamin that Joseph disclosed his identity and Judah was exonerated from guilt in this matter. Therefore And the envy of Ephraim was turned (Isa. 11:13). Hence, Scripture states: And he sent Judah before him.

[Gen. 46:28:) NOW HE HAD SENT JUDAH.] The text is related (to Is. 11:13): THEN EPHRAIM'S JEALOUSY SHALL DEPART.³³Tanh., Gen. 11:9; Gen. R. 95:2. < He was sent > because our father Jacob thought that Judah had killed Joseph because he had brought him the tunic, about which it is stated (in Gen. 37:33): HE RECOGNIZED IT AND SAID: MY SON'S TUNIC! AN EVIL BEAST HAS EATEN HIM. Now AN EVIL BEAST is nothing but a lion.³⁴According to Gen. 49:9, JUDAH IS A LION’S WHELP. So Jacob said to him: You have torn him to pieces, and you are going to tear his brother to pieces. You would not have torn him to pieces except out of jealousy. Immediately (there follows in Gen. 37:34): THEN JACOB RENT HIS GARMENTS….