Hullin 89: The Beautiful Blue of the Heavens and the Sea

Beginning with some aggadic material - with Abraham claiming about himself that he is nothing but dust and ashes, and that he and his descendants have 2 mitzvot. Which 2 mitzvot is a matter of discussion. The discussion leads to the color of "tekhelet" -- the blue thread in tzitzit, the ritual fringes, and what makes them distinctive. Plus, an encounter with Nimrod. Also, chapter 7! With a new mishnah, and the wrestling between Jacob and the angel, which leads to the prohibition of the sciatic nerve, the "gid ha-nasheh," and the many details pertaining to it.