Midras Kejadian 36:20: Midrash Tanchuma, Ein Yaakov (Glick Edition), Aggadat Bereshit & Bereshit Rabbah

You find likewise (that the expression sat also alludes to) the degeneracy of the descendants of Seir, since it is written: These are the sons of Seir the Horite, who sat on the land: Lotan and Shobal and Zibeon and Anah (Gen. 36:20). However, Anah is elsewhere called the son of Zibeon: And these are the children of Zibeon: Aiah and Anah (ibid., v. 24). We learn from this that Zibeon had sexual relations with his own mother, and conceived and begot Anah by her. Consequently, (Anah) was both (Zibeon’s) brother and his son. Later he had intercourse with his daughter-in-law, the wife of Anah, and Oholibamah was their child, as it is said: And these were the sons of Oholibamah the daughter of Anah, the daughter of Zibeon, Esau’s wife (ibid., v. 14), and Esau took her as a wife. Inasmuch as they were all products of incestuous relations, Scripture mentions them only to disclose their degeneracy.

(Fol. 85a) R. Chiya b. Abba said: "What is meant by the passage (Deut. 19, 14.) Thou shalt not remove thy neighbor's landmark, which the people of old have set, i.e, Thou shalt not go beyond what is limited by those of old." What have those of old limited? R. Samuel b. Nachmeini, in the name of R. Jochanan, said: "It is WTitten (Gen. 36, 20.) These are the sons of Seir the Chorite, who inhabited the land. Did the rest of mankind inhabit heaven? But [it means that] they were experts in agriculture. 'This measure [of ground],' they would say, ' is adequate for [the planting of] olive trees; this measure of ground for wines, and this measure for dates.'" What does V'chori mean? This means they used to smell the earth. And what means Ve'chiri? R. Papa said; "They tasted the earth [to know for what it would be adequate] as a serpent does." R. Acha b. Jacob said: "Chori means they became freed of their wealth [because they lost it]."

Chapter 29: Prophets [1] "For the LORD had closed Hannah's womb." (1 Samuel 2:21) This refers to the statement "I will not cause pain nor create children" (Isaiah 66:9), which is talking about Hannah, as it is said "And unto Hannah he gave a worthy portion; for he loved Hannah, but the LORD had shut up her womb." (1 Samuel 1:5) "[If I am the one who gives birth and stops it]" (Isaiah, same verse). If I am the one who gives birth to Sarah and stops it for Abimelech's household, [as it says] "for he had closed up every womb" (Genesis 20:18). Another interpretation is that if I am the one who gives birth to Israel, as it says "who are born from me" (Isaiah 46:3), and I stop it for the enemy, as it says "all the nations are as nothing before Him" (Isaiah 40:17), for it is written "I will cut off from Babylon name and remnant, descendants and posterity, declares the Lord" (Isaiah 14:22). "This name is her currency. She'ar (remnant) will not be a survivor, etc." (Obadiah 1:18), "And the son (nephew) represents the kingdom, and the grandson represents the general. Alternatively, if I give birth to Zion, as it says, "For Zion has gone into labor and has given birth to her children" (Isaiah 66:8)." "And Atzeret (עצרתי) refers to Sodom. Its inhabitants will also die like that (ימותון - will die) (Isaiah 1:9). This is Sodom, as it says, "These are the sons of Seir the Horite [the inhabitants of the land]" (Genesis 36:20). But for Israel, "my salvation will be forever" (Isaiah 51:6)."