al-Habīb Zayn Bin Sumait, may Allāh preserve him, in the al-Fuyūdhāt ar-Rabbaniyah said:
The Ahl al-Bayt and the Qur’ān
The Messenger of Allāh, Salutations of Allāh and His Peace upon him said:
Indeed, I left in your midst something in which if you all were to hold on to, you will not go astray (dhalāl) after me. One of it is a’zham (greater) than the other. The book of Allāh, a rope which is extended from the sky to the earth, and my ‘itrah which is my ahl al-bayt, they both do not separate until they both arrive upon me at the haudh (lake fount). So look at how you come after me with regard to the two.
Narrated by at-Tirmiźī, narrated by al-Imām Ahmad and others with another phrasing.