The Kassideans or Assideans...arose either during the Captivity or soon after the restoration...The Essenians were, however, undoubtedly connected with the Temple (of Solomon), as their origin is derived by the learned Scalier, with every appearance of truth, from the Kassideans, a fraternity of Jewish devotees, who, in the language of Laurie, had associated together as 'Knights of the Temple of Jerusalem.'...From the Essenians Pythagoras derived much, if not all, of the knowledge and the ceremonies with which he clothed the esoteric school of his philosophy.
Albert Mackey
