Hadith No: 1
Ibn al-Athir - Asad al-Ghabah fi Ma'rifat al-Sahabah
Chapter on the letter Haa - Chapter on the letters Haa and Seen - Al-Hasan ibn Ali (peace be upon them)
Volume: (1) - Hadith Number: (490)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Muhammad said: Alī ibn al-Munthir al-Kūfi narrated to us, saying: Muhammad ibn Fadl narrated to us, mentioning that al-A'mash narrated to us from Atiyyah, from Abu Sa'id, and al-A'mash from Habib ibn Abi Thabit from Zayd ibn Arqam, who said: The Messenger of Allah (peace be upon him and his holy progeny) said: "I am leaving among you that which, if you hold fast to it, you will not go astray; one of them is greater than the other: the Book of Allah, a rope extended from the heaven to the earth, and my Ahl al-Bayt. They will not separate until they return to me at the Pond. So, look how you will respond to me concerning both of them."

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Reference: Osad al-Ghabah fi Ma'refah al-Shahabah Book 1 Tradition No. 490

Hadith No: 2
Ibn al-Athir - al-Nihayah fi Gharib al-Hadith wa al-Athar
Letter 'Ayn - Chapter on 'Ayn with 'Ta' - 'Itr
Volume: (3) - Page Number: (177)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... 'Itr: It is stated in it: "I am leaving among you the two precious things, the Book of Allah and My 'Itrah." The 'Itrah of a man refers to his closest relatives, and the 'Itrah of the Prophet (peace be upon him and his holy progeny) is the Banu Abdul Muttalib. It is said that they are his nearest family, namely, his children, Ali, and his children. Others say that his 'Itrah includes both the closest and the more distant relatives.

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Reference: Al Nihaayaa fi gareeb al hadis wal asar Book 3