Shabbat 70a and Shabbat 70b, much of it taken up with deriving the idea of hilluk melakhot, how each category of melakha on Shabbat incurs its own korban hatat, hatat sacrifice, if violated unwittingly. While getting there, we also saw the interesting debate about whether hav’arah, burning fire, was a full-fledged category of prohibited activity, singled out by the Torah to teach the concept, or was only a plain prohibition. The debate also took us into issues of middot she-ha-Torah nidreshet bahen, the ways Hazal derive new ideas from the Torah.
