سورة الأعراف

Imam Baqir (peace be upon him): وَ الَّذینَ یُمَسِّکُونَ بِالْکِتابِ [And those who hold fast by the Book] ... this verse was revealed concerning the family of Muhammad (peace be upon him and his family) and their Shia.

Imam Ali (peace be upon him): Until you recognise the one who has broken the covenant of the Quran, you will not establish a firm covenant with the Quran; and until you recognise the one who has cast the Quran aside, you cannot take hold of it. So seek deliverance from those who are its people — and they are from the household of the Prophets, by whom knowledge is alive and through whose knowledge ignorance is dead. They are the ones whose ruling informs you of their knowledge, whose silence informs you of their speech, and whose outward appearance reveals their inward reality. They neither oppose the religion nor differ over it. Among them the religion is a truthful witness and a speaking silence.