Hadith No: 1
Ibn Abi al-Hadid - Sharh Nahj al-Balagha
Volume: (6) - Page Number: (375)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... And the Messenger of Allah (peace be upon him and his holy progeny) clearly indicated who his Ahlulbayt (his family) were when he said: "I am leaving among you two precious things," and he said, "my Ahlulbayt."

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Reference: Sharh Nahj al-Balaaghah Book 6

Hadith No: 2
Ibn Abi al-Hadid - Sharh Nahj al-Balagha
Volume: (9) - Page Number: (133)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... an absolute mention, not attributed to any specific knowledge, as one might say: the People of the House, and the listener would understand that he means the Family of the Messenger, and they referred to the cause, meaning the People of the House as well. And this is a reference to the Prophet's (peace be upon him and his holy progeny) statement: "I left among you the two precious things, the Book of Allah and my Ahlulbayt (my family). They are two unwavering ropes extended from heaven to earth, and they will not separate until they return to me at the Pool." Thus, the Commander of the Faithful expressed the Ahlulbayt with the term cause because the Prophet (peace be upon him and his holy progeny) had said: ropes, and in language, a cause (sabab) is synonymous with a rope (habl).

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Reference: Sharh Nahj al-Balaaghah Book 9

Hadith No: 3
Ibn Abi al-Hadid - Sharh Nahj al-Balaghah
Volume: (18) - Page Number: (43)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Among them is his statement: "And hold fast to the rope of the Quran." It has come in the raised narration when the two weighty things were mentioned, he said: "One of them is the Book of Allah, a rope extended from heaven to earth, one end in the hand of Allah and the other in your hands."

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Reference: Sharh Nahj al-Balaaghah Book 18