Ayin Beis
 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). This series of Chassidic essays are considered a fundamental work of Chabad mysticism for its original treatment of many Chassidic concepts. 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).