This chapter illustrates the ways in which the revolutionary dimension of the early Fatimid interpretive system was organized on the realm of terrestrial history. Preparations for the arrival of a utopian existence were carried out through the secret development of an extensive system of networks called the daʿwa, the summons or call, a hierarchical network that was responsible for recruitment to the Fatimid cause. In the Fatimid vision, the entire world became divided into regions that were headed by or were to be headed by significant members of the daʿwa. Those who wished to join the Fatimid cause were required to pledge an oath of allegiance in anticipation of the mahdi’s imminent arrival. This chapter discusses the nature of this oath at length, paying particular attention to how pledging it became central to the salvific paradigm, bestowing upon the believer a spiritually exalted lineage, one shared by prophets and other sacred personnel throughout history. In exchange for pledging the oath and working on behalf of the awaited mahdi, initiates became acquainted with the hidden meanings of revelation, and thus access to the tools of salvation.