Nedarim 62: The Great Rabbi Tarfon

Several stories about Rabbi Tarfon, including his reputation, and how he made use of it. [Who's Who: R. Tarfon] Also, harvesting as a time that defines or limits a vow - with mention of several different harvests. Likewise, referring to the rainfall as a way to define time (we didn't know it would happen when we recorded, but this day in Israel is a representative very rainy day).