For the source text click/tap here: Bava Batra 115
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Rav Huna says that Rav says: With regard to anyone who says that a daughter of the deceased should inherit the estate of her father along with the daughter of the son of the deceased, even if he is a prince of the Jewish people, one should not listen to him, as this is nothing other than an act of the Sadducees and runs counter to the ruling of the mishna that the descendants of a son inherit before a daughter.
As the Sadducees would say: A daughter should inherit the estate of her father along with the daughter of the son of the deceased.
Rabbi Yochana ben Zakkai then engages in a polemical exegesis including the verses:
“These are the sons of Seir the Horite, the inhabitants of the land: Lotan and Shobal and Zibeon and Anah” (Genesis 36:20), then contradictory :
“And these are the children of Zibeon: Aiah and Anah” (Genesis 36:24). The first verse portrays Zibeon and Anah as brothers, while the second states that they are father and son.
Rather, this teaches that Zibeon engaged in sexual intercourse with his mother and begot Anah, so that he was both Anah’s father and his brother.
We explore the character and midrashic descriptions of Anah and the inventions of fire and the mule.