With a brief look at the history of humankind, it has been observed that followers of some leaders, without any force and with a full consent and voluntarily turned their absolute obedience to their leaders. In this research, besides surveying the reasons of this kind of obedience, Ismailia during the leadership of Hassan Sabbah as the case study, has been studied by a commentary and review approach. Hence, in the first step by applying the historical action research method, the reasons of Ismailia pure obedience to Hassan Sabbah have been identified. Then the initial codes were analysed and reviewed for several times by MAXQDA software and finally four main criteria and 46 sub–criteria from the set of data have been identified. In the end, by consultation with the experts and using the analytic hierarchy process, the reasons of the pure obedience of the Ismailia have prioritized. The results show that such factors as authoritarian leadership and material factors have been negligible impact on the pure obedience of this group and the factors attributed to religion were the most influential factors on the pure obedience in this group.