Abrahadabra is a word that first appears in The Book of the Law, the central sacred text of Thelema. Its scribe, Aleister Crowley, described it as the "the Word of the Aeon, which signifieth The Great Work accomplished." This is in reference to his belief that the writing of Liber Legis heralded a new Aeon for mankind that was ruled by the god Ra-Hoor-Khuit (a form of Horus).