For the source text click/tap here: Pesachim 62
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Rabbi Simlai came before Rabbi Yoḥanan. He said to him: Would the Master teach me the Book of Genealogies?
The Book of Genealogies was a collection of tannaitic teachings that formed a midrash on the book of Chronicles.
This leads us to examining the notion of Yichus as applied to Chronicles vs kings and in Midrash.