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In the Islamic thought, the term of Ahl al-Bayt/Ahlul Bayt that was mentioned in three verses at the Quran has been understood and interpreted differently by the Shiite and Sunnite exegetes and scholars. But what does Ahl al-Bayt mean in the Quranic context? In this paper, it has been dealt with the Shiite/Shi’ite exegetes’ approaches to those verses and their using them to prove the infallibility of Ahl al-Bayt and the twelve Imams from their point of view. In addition to that, the verses that mentioned Ahlul Bayt have been explained according to the thoughts of Sunnite exegetes and commentaries. Finally, it has been discussed the value and validity of their thoughts from our point of view and the real meaning of these verses in the Quranic context and unitiy.