The Banu Umayyah (Umayyids) have a fixed period (mirwad) wherein they are having their way. But when differences arise among them then even if the hyena attacks them it will overpower them. As-Sayyid ar-Radi says: Herein ‘mirward’ is a form derived from ‘irwad’ which means to allow time, to wait for. It is an extremely eloquent and wonderful expression. It is as though the Commander of the Faithful (A) has likened the period of Banu Umayyah to a limited area meant for the training of horses for racing where they are running towards the limit, so that when they reach its extremity their organization will be destroyed.