Yud-Tes Kislev Maamar, The Release of the Alter Rebbe from Jail Vol. 2
Maamarim of the Lubavitcher Rebbe, Rabbi Menachem M. Schneerson by Rabbi Yosef Shusterman
On the 19th of Kislev (Yud-Tes Kislev) 1798 Rabbi Schneur Zalman of Liadi (1745-1812), the founder of Chabad Chassidism,
was freed from his imprisonment in czarist Russia. This date is celebrated as the Rosh Hashanah of Chassidism.