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The research deals with the statement of the importance of unanimous in Islamic Sharia in terms of being the third source of Islamic legislation after the Holy Qur’an and the Sunnah of the Prophet, and the extent of interest of the scholars of interpretation in it, and those who took great interest in mentioning what was agreed upon in every site that necessitated mentioning its issues within, or mentioning an event that has encountered an unanimous, and in various sciences, to extract and extrapolate Sharia rules when these rules are lost in the texts, because it is based on them and derived from them. Among these distinguished scholars is Muhammad bin Jarir al-Tabari. Besides, the research discusses interpretational applications for some meanings of Quran’ vocabulary, as well as the opinion of al-Tabari in some Fiqh rules that he was singled out for based on his disagreement with the majority of fundamentalists on a fundamental issue of unanimous issues, namely: Does unanimous convenes when the most diligent of the scholars state about a matter that needs their unanimous? Or is it not convened without the agreement of all of them without violating any of them? So, he went on to say: The unanimous is convened with the disagreement of one and two of scholars in face of the agreement of most of the agreed ones, because the majorities are scholars and interpreters. Thus, he adopts the unanimous of the majority, and, for him, those who have not reached the limit of the frequency have been considered neither as a disagreement issue nor breaking the unanimous, nor disagreeing with it. In this issue, the majority of the scholars said: The condition for convening the unanimous along with its occurrence is the agreement of all diligents without fear of any one of them, otherwise there will be no unanimous