Midrash su Genesi 47:20

“Like the tents of Kedar,” just as the tents of Kedar appear externally to be ugly, black, and in tatters, but internally they are gems and pearls, so too Torah scholars, even though they appear ugly and black in this world, internally there is Torah in them, Bible, Mishna, Midrash, halakhot, Talmud, Tosefta, and aggada. If so, just as tents of Kedar do not require laundering, perhaps the same is true of Israel; the verse states: “Like the curtains of Solomon”—just as these curtains of Solomon are soiled and laundered, and are again soiled and laundered, so, too, Israel, even though they are soiled with sins all the days of the year, Yom Kippur arrives and atones for them, as it is stated: “For on this day He will atone for you” (Leviticus 16:30), and it is written: “If your sins will be like scarlet, they will be whitened as snow; if they will be reddened like crimson, they will be like wool” (Isaiah 1:18).
If so, just as the tents of Kedar are moved from place to place, perhaps the same is true of Israel. The verse states: “Like the curtains of Solomon [Shelomo],” like the curtains¹⁹⁷The heavens. of the One [of Whom it may be stated] that the peace is His, the One Who spoke and the world came into being, that from the moment He spread them, they did not move from their place. Rabbi Eliezer ben Yaakov taught: “A tent that will not be displaced [yatzan]” (Isaiah 33:20); it will not emerge [yetze] and will not move [yanua].¹⁹⁸Yatzan is an acronym of yetze and yanua.
Just as the tents of Kedar are not subject to the yoke of any creature,¹⁹⁹The reference is to nomads who live in the wilderness. so too, Israel, in the future, will not be subject to the yoke of any creature. Rabbi Ḥiyya taught: “I led you upright” (Leviticus 26:13); with an upright stature, without fear of any creature.²⁰⁰Although the verse cited is stated regarding the exodus from Egypt, it is understood as also alluding to the future redemption. Rabbi Yudan said: Like Joseph; just as Joseph was sold to the tents of Kedar, as it is stated: “They sold Joseph to the Ishmaelites… [and they brought Joseph to Egypt]” (Genesis 37:28), and he then purchased his purchasers, as it is stated: “Joseph purchased all the land of Egypt” (Genesis 47:20), so too Israel: “They will be captors of their captors” (Isaiah 14:2).