Midras 1 Raja-raja 21:27: Shir HaShirim Rabbah, Esther Rabbah & Bereshit Rabbah

“I am black,” this is referring to Ahab, as it is stated: “It was when Ahab heard these matters that he rent his garments [and placed sackcloth upon his flesh, and he fasted]” (I Kings 21:27). How much did he fast? Rabbi Yehoshua ben Levi said: Three hours. If he was accustomed to eat his meal at three hours, he ate at six, and if he would eat at six, he ate at nine. “He lay in sackcloth, and walked slowly” (I Kings 21:27). Rabbi Yehoshua ben Levi said: He walked barefoot.¹⁹¹One who walks barefoot often walks more slowly than usual. The point here is that although Ahab was a wicked king, and is therefore called “black,” he humbled himself before God and his repentance was accepted (see I Kings 21:29), and is therefore also “lovely.” [Similarly,] regarding Yehoram, what is written? “The people saw, and behold, the sackcloth was upon his flesh underneath” (II Kings 6:30).
Rabbi Levi Bar Ḥaita said three approaches in regard to this [verse]: I am black all the days of the week and I am lovely on Shabbat. I am black all the days of the year and I am lovely on Yom Kippur. I am black regarding the Ten Tribes and I am lovely regarding the tribes of Judah and Benjamin.
I am black in this world and I am lovely in the World to Come.

“Mordekhai knew everything that had been done, and Mordekhai rent his garments and donned sackcloth and ashes. He went out in the midst of the city and cried a loud and bitter cry” (Esther 4:1).
“Mordekhai knew everything that had been done, and Mordekhai rent his garments.” Benjamin caused the tribes [his brothers] to rend; that is what is written: “They rent their garments” (Genesis 44:13). Where was he caused to rend? It was in Shushan the citadel; that is what is written: “Mordekhai rent his garments,” and he was from the tribe of Benjamin.¹The midrash is stating that the fact that Mordekhai had to rend his garments is in some respects a punishment for Binyamin having caused his brothers to have to rend their garments. This is because he was not careful enough and did not notice that the silver goblet had been placed in his sack (Etz Yosef).
“He donned sackcloth and ashes.” Rabbi Aivu said: Once Jacob our patriarch adopted sackcloth, as it is written: “He placed sackcloth on his loins” (Genesis 37:34), it never again left his descendants. It is written about Ahab: “He placed sackcloth on his flesh” (I Kings 21:27); his son Yoram: “The people saw, and behold, the sackcloth was on his flesh” (II Kings 6:30); Mordekhai, “He donned sackcloth and ashes.”
“He [Esau] cried a loud and bitter cry” (Genesis 27:34). Where was he repaid? In Shushan, as it is stated: “[Mordekhai] cried a loud and bitter cry.” Rabbi Ḥanin said: Anyone who says that the All-Merciful is One who forgoes, his innards will be forgone. He is forbearing, but then collects His due. Know that Jacob caused Esau to cry one cry, as it is written: “He cried a loud and bitter cry” [and as a result, Jacob’s descendant, Mordekhai, cried a loud and bitter cry].

“Jacob rent his garments, placed sackcloth on his loins, and mourned his son many days” (Genesis 37:34).
“Jacob rent his garments” – Rabbi Pinḥas said in the name of Rabbi Hoshaya: The tribes caused their father to rend. Where did they receive retribution? In Egypt, as it was stated: “They rent their garments…” (Genesis 44:13). Joseph caused the tribes to rend; his descendant arose, and retribution was exacted against him, as it is stated: “Joshua rent his garments” (Joshua 7:6). Benjamin caused the tribes to rend.⁶⁴When Joseph’s goblet was found in Benjamin’s sack, his brothers rent their garments. Although this was not Benjamin’s fault, since it occurred through him, he was also punished. Alternatively, knowing that his brothers’ money was returned on their first trip, he should have checked his sack before setting out (Yefe To’ar). Where was retribution exacted against him? In Shushan the citadel, as it is stated: “Mordekhai rent his garments” (Esther 4:1). Manasseh caused the tribes to rend;⁶⁵Manasseh was the messenger Joseph sent to search his brothers’ sacks (Matnot Kehuna). that is why his inheritance was split, half of it in the land of the Jordan and half of it in the land of Canaan.
“Placed sackcloth on his loins” – Rabbi Aivu said: Because Jacob our patriarch adopted sackcloth, it does not depart from him, from his children, and from his descendants until the end of all the generations. But it is practiced only among his prominent descendants, [such as] David, as it is stated: “David and the elders, covered in sackcloth, fell on their faces” (I Chronicles 21:16). Ahab – “and placed sackcloth upon his flesh” (I Kings 21:27). Yoram – “the people looked, and behold, the sackcloth was upon his flesh” (II Kings 6:30). Mordekhai – “he donned sackcloth and ashes” (Esther 4:1).
“And mourned his son many days” – these were twenty-two years.⁶⁶Joseph was sold at age seventeen and stood before Pharaoh at age thirty. His father descended to Egypt in the second year of the famine that followed the seven years of plenty. Joseph was then thirty-nine years old. Thus, he was separated from Jacob for twenty-two years, corresponding to the twenty-two years that Jacob was away from his father.