Ibne Babawayh, Saffar and Mufeed have authentically narrated from Imam Sadiq (a.s.) that the earth will not remain balanced unless there is a scholar who may know about the benefit or harm to religion so that if the believers make any addition in religion he may make them return towards the divine limits and if they curtail anything in religion he may make it perfect. In short, that scholar will say: Take up the religion totally and perfectly.