Chabad book
Sefer Hamamaarim 5672 (Hebrew: ספר המאמרים תרע״ב), or Ayin Beis, is a compilation of the Chasidic treatises by Rabbi Sholom Dovber Schneersohn, the fifth Rebbe of Chabad, from the Hebrew year 5672 (1911-12).[1][2] This series of Chassidic essays are considered a fundamental work of Chabad mysticism for its original treatment of many Chassidic concepts.[3] 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").