Hadith No: 1
Ahmad ibn Hanbal - Musnad al-Imam Ahmad ibn Hanbal
Remaining Musnad of the Plentiful Ones - Musnad Abu Sa'id al-Khudri (r)
Volume: (3) - Page Number: (86)
11408 - Ya'qub narrated to us, who said: My father narrated to us, from Ibn Ishaq, who said: Abdullah ibn Abdul Rahman ibn Maimun ibn Hazm narrated to me, from Sulayman ibn Muhammad ibn Kab ibn Ujrah, from his aunt Zaynab bint Kab, who was married to Abu Sa'id al-Khudri, from Abu Sa'id al-Khudri who said: "The people complained about Ali. Then the Messenger of Allah (peace be upon him) stood among us, delivering a sermon, and I heard him say: 'O people, do not complain about Ali. For by Allah, he is indeed harsher in defending the truth of Allah or in the path of Allah.'"

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Reference: Musnad Ahmad Ibn Hanbal Book 3

Hadith No: 2
Ahmad ibn Hanbal - Fada'il al-Sahaba - And Among the Virtues of Ali (peace be upon him)
And among the virtues of Ali (may Allah be pleased with him) from the narration of Abu Bakr ibn Malik through his teachers, except for Abdullah
Volume: (2) - Page Number: (679)
1161 - Yaqoub ibn Ibrahim narrated to us, saying: My father narrated to us from Abu Ishaq, who said: Abdullah ibn Abd al-Rahman ibn Muawiya narrated to me, and he was Abu Talawah al-Ansari, from Sulayman ibn Muhammad ibn Kab ibn Ujrah, from Zaynab and the son of Abu Sa'id from Abu Sa'id al-Khudri, who said: "Ali, meaning Ibn Abi Talib, complained about the people to the Messenger of Allah (peace be upon him and his holy progeny). He stood among us delivering a sermon, and I heard him say: 'O people, do not complain about Ali.' By Allah, he is indeed my brother in defending Allah and in the path of Allah."

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Reference: Fazael al-Sahabah Book 2

Hadith No: 3
Al-Hakim al-Nishapuri - Al-Mustadrak ala al-Sahihayn
Book of Knowledge of the Companions (ra) - Prohibition of Complaining about Ali (ra)
Volume: (3) - Page Number: (134)
4710 - Ahmad ibn Jaafar al-Quti'i narrated to us, saying: Abdullah ibn Ahmad ibn Hanbal narrated to me, saying: My father narrated to us, saying: Ya'qub ibn Ibrahim ibn Sa'd narrated to us, from my father, from Ibn Ishaq, who said: Abdullah ibn Abd al-Rahman ibn Ma'mar, Abu Tawalah al-Ansari, narrated to me from Sulayman ibn Muhammad ibn Kab ibn Ujrah, from Zainab, daughter of Abu Sa'id, from Abu Sa'id al-Khudri (ra), who said: "Ali ibn Abi Talib complained about the people to the Messenger of Allah (peace be upon him and his holy progeny). So he stood among us giving a sermon, and I heard him say: 'O people, do not complain about Ali. By Allah, he is indeed the sternest in matters related to Allah and in the path of Allah.'" This is a hadith with a sound chain of narration, and they did not include it in their compilations.

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Reference: Al-Mustadarak ala al-Saheehain Book 3

Hadith No: 4
Al-Haythami - Majma' al-Zawa'id wa Manba' al-Fawa'id
Chapters on the Virtues of Ali ibn Abi Talib (peace be upon him) - A Comprehensive Chapter on Those Who Love Him and Those Who Bear Him Malice
Volume: (9) - Page Number: (129)
14735 - And from Abu Sa'id al-Khudri who said: People complained about Ali, and the Messenger of Allah (peace be upon him and his holy progeny) stood among us giving a sermon, and I heard him say: O people, do not complain about Ali, for by Allah, he is indeed the most fearful of Him in matters of His essence or in the way of Allah. This was narrated by Ahmad.

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Reference: Majma al-Zawaaed wa Mamba' al-Fawaaed Book 9

Hadith No: 5
Ibn Kathir - Al-Bidaya wa'l-Nihaya - Year Forty of the Noble Hijra
Chapter on Mentioning Some of the Virtues of the Commander of the Faithful, Ali ibn Abi Talib (peace be upon him)
The Marriage of Ali and Fatimah al-Zahra (peace be upon her)
Volume: (11) - Page Number: (63)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... From Ibn Ishaq: Abdullah ibn Abdul Rahman ibn Mu'mar ibn Hazm narrated to me from Sulaiman ibn Muhammad ibn Kab ibn Ujra from his aunt Zainab bint Kab - who was married to Abu al-Khudri - from Abu Sa'id who said: "The people complained about Ali, and the Messenger of Allah (peace be upon him and his holy progeny) stood up among us delivering a sermon, and I heard him say: 'O people, do not complain about Ali, for by Allah, he is more severe in defending the truth of Allah or in the cause of Allah than to be complained about.'" This was also reported by Imam Ahmad from the narration of Muhammad ibn Ishaq, who said: "more severe in defending the truth of Allah or in the cause of Allah."

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Reference: Al-Bidaayah wa al-Nihaayah Book 11

Hadith No: 6
Al-Esfahani - Haliyat al-Awliya wa Tabaqat al-Asfiyae - Ali ibn Abi Talib (peace be upon him) and the leader of the people ...
Volume: (1) - Page Number: (68)
- Abu Bakr ibn Khalad narrated to us, who said: Ahmad ibn Ali al-Kharraz narrated to us, who said: Abd al-Rahman ibn Hafs al-Tanafsi narrated to us, who said: Ziyad ibn Abdullah narrated to us, from Abu Ishaq, from Abdullah ibn Abd al-Rahman ibn Ma'mar, from Sulayman, meaning the son of Muhammad ibn Kab ibn Ujra, from his aunt Zaynab bint Kab, who was married to Abu Sa'id from Abu Sa'id al-Khudri, who said: "The people complained about Ali, and the Messenger of Allah (peace be upon him and his holy progeny) stood up as a speaker and said: 'O people, do not complain about Ali.' By Allah, he is indeed the sternest in defending the cause of Allah, the Mighty and Majestic."

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Reference: Hilyah al-Awliyah Wa Tabaqaat al-Asfeyaa Book 1

Hadith No: 7
Al-Muttaqi al-Hindi - Kanz al-'Ummal fi Sunan al-Aqwal wal-Af'al
Volume: (11) - Page Number: (620)
33014 - O people, do not complain to me, for by Allah, he is indeed more harsh towards my brother in the cause of Allah, the Almighty, and in the path of Allah.
33015 - O people, do not complain to me, for by Allah, he is indeed more harsh in the religion of Allah.

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Reference: Kanz al-Ummaal fi Sunan al-Aqwaal wa al-Af'aal Book 11