 The Ayin Beis series is one of the single longest works of Chabad philosophy.The work is also referred to as "Hemshech Ayin Beis" (""Ayin Beis Series"").On May 22, 1912 (6 Sivan 5672), Rabbi Sholom Dovber Schneersohn, the fifth Rebbe of the Chabad-Lubavitch Hasidic movement began delivering a series of public sermons on Jewish mysticism and Chabad philosophy.