Chof Cheshvan is the 20th day of Cheshvan and the birthday of the Rebbe Rashab, the 5th Lubavitcher Rebbe in 5621/1860. He founded the flagship Chabad yeshivah Tomchei Temimim, the first to incorporate Chasidic thought into its syllabus. The Rebbe Rashab became known as the “Maimonides of Chabad Chassidism,” for his ability to organize topics in chassidic thought and would often recite "hemsheichim" (long series of discourses)—some that lasted for several years! click here to see classes on his teachings.