Hadith No: 1
Ahmad ibn Hanbal - Musnad al-Imam Ahmad ibn Hanbal
Musnad of the Ahl al-Bayt (peace be upon them) - Hadith on al-Hasan ibn Ali ibn Abi Talib (peace be upon him)
Volume: (1) - Page Number: (199)
1721 - Waki' narrated to us, from Sharik, from Abu Ishaq, from Hubayra: Al-Hasan ibn Ali (peace be upon him) delivered a sermon to us and said: "Indeed, a man has departed from you yesterday, who was not preceded by the earlier ones in knowledge, nor will the later ones be able to reach him." The Messenger of Allah (peace be upon him and his holy progeny) would send him forth with the banner, Gabriel on his right, and Michael on his left, and he would not return until victory was granted to him.

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Reference: Musnad Ahmad Ibn Hanbal Book 1

Hadith No: 2
Ahmad ibn Hanbal - Musnad Imam Ahmad ibn Hanbal
Musnad Ahl al-Bayt (peace be upon them) - Hadith of Hasan ibn Ali ibn Abi Talib (peace be upon him)
Volume: (1) - Page Number: (199/200)
1722 - Waki' narrated to us, from Isra'il, from Abu Ishaq, from 'Amr ibn Hubshi, who said: Al-Hasan ibn Ali addressed us after the killing of Ali, and he said: "A man has departed from you yesterday who was not preceded by those before him in knowledge, nor will those after him be able to attain his level." If the Messenger of Allah (peace be upon him and his holy progeny) was truly to send him and give him the banner, he would not return until victory was granted to him, and he left nothing of gold or silver except for seven hundred dirhams from his allotment that he had been saving for a servant for his family. Abd al-Razzaq narrated to us, saying: Sufyan narrated to us, from Abu Ishaq, from Burayd ibn Abi Maryam, from Abu al-Hawrа', from Hasan ibn Ali, that the Messenger of Allah (peace be upon him and his holy progeny) taught him to say in the Witr prayer, and he mentioned something similar to the hadith of Yunus.

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Reference: Musnad Ahmad Ibn Hanbal Book 1

Hadith No: 3
Al-Hakim al-Nisapouri - al-Mustadrak ala al-Sahihayn
Book of the Knowledge of the Companions - The Prophet (peace be upon him and his holy progeny) said to Ali: "You will clarify to my Ummah what they will differ on after me."
Volume: (3) - Page Number: (122)
4678 - Abdān ibn Yazid ibn Ya'qub al-Duqaq narrated to us from his own book, saying: Ibrahim ibn al-Husayn ibn Dīzil narrated to us, saying: Abu Na'im Dhurar ibn Sard narrated to us, saying: Mu'tamir ibn Sulayman narrated to us, who said: I heard my father mention from al-Hasan from Anas ibn Malik (may Allah be pleased with him): that the Prophet(peace be upon him and his holy progeny) said to Ali: "You will clarify to my Ummah what they will differ on after me." This is a hadith that is authentic on the criteria of the two Shaykhs, and they did not include it in their collections.

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Reference: Al-Mustadarak ala al-Saheehain Book 3

Hadith No: 4
Al-Hakim al-Nisapouri - Al-Mustadrak 'ala al-Sahihain
Book of the Knowledge of the Companions (r) - Ali was the first of us to join him and the most resolute among us in faith
Volume: (3) - Page Number: (126)
4690 - Abu al-Nadr Muhammad ibn Yusuf al-Faqih narrated to us, saying: Uthman ibn Sa'id al-Darani narrated to us, saying: al-Nufaili narrated to us, saying: Zuhair narrated to us, from Abu Ishaq, who said: Uthman also narrated to us, and Ali ibn Hakim al-Awdi and Amr ibn Aun al-Wasiti both said: Sharik ibn Abdullah narrated to us from Abu Ishaq, who said: I asked Quthum ibn al-Abbas: "How did Ali inherit from the Messenger of Allah (peace be upon him and his holy progeny) above you?" He replied: "Because he was the first of us to join him and the most resolute among us in faith." This is a narration with a reliable chain of transmission, and they did not include it in their collections.
I heard the Qadi al-Qudat, Abu al-Hasan Muhammad ibn Salih al-Hashimi, say: I heard Abu Umar al-Qadi say: I heard Isma'il ibn Ishaq al-Qadi say, and he mentioned Quthum's statement: "Surely an inheritor inherits only by blood or by allegiance, and there is no disagreement among the scholars that a cousin does not inherit in the presence of an uncle." Thus, this consensus shows that Ali inherited knowledge from the Prophet (peace be upon him and his holy progeny) above them, and affirms the correctness of what the qadi mentioned.

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Reference: Al-Mustadarak ala al-Saheehain Book 3

Hadith No: 5
Ibn al-A'rabi - Al-Mu'jam - Chapter (N)
Volume: (3) - Page Number: (1107)
2389 - Na: Najih narrated to us, saying: Abu Na'im Durar ibn Sard narrated to us, from al-Mu'tamir ibn Sulayman al-Taimi, who said: I heard my father mention from al-Hasan from Anas that the Prophet (peace be upon him and his holy progeny) said to Ali: "You will clarify to my Ummah what they differ about after me."

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Reference: Moajam Abu Yaala Mosuli Book 3

Hadith No: 6
Al-Muttaqi al-Hindi - Kanz al-Ummal fi Sunan al-Aqwal wal-Af'al
Volume: (11) - Hadith Number: (603)
32911 - Ali at the threshold of my knowledge.

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Reference: Kanz al-Ummaal fi Sunan al-Aqwaal wa al-Af'aal Book 11 Tradition No. 603

Hadith No: 7
Al-Muttaqi al-Hindi - Kanz al-Ummal fi Sunan al-Aqwal wa-l-Af'al
Volume: (11) - Hadith Number: (614)
32977 - "The most knowledgeable of my Ummah after me is Ali ibn Abi Talib."
32980 - "Ali ibn Abi Talib is the most knowledgeable of people regarding Allah, and people loved and revered him as they did the People of La ilaha illallah."

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Reference: Kanz al-Ummaal fi Sunan al-Aqwaal wa al-Af'aal Book 11 Tradition No. 614

Hadith No: 8
Al-Muttaqi al-Hindi - Kanz al-Ummal fi Sunan al-Aqwal wal-Af'al
Volume: (11) - Hadith Number: (615)
32983 - O Ali, you will clarify to my Ummah what they differ about after me.

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Reference: Kanz al-Ummaal fi Sunan al-Aqwaal wa al-Af'aal Book 11 Tradition No. 615

Hadith No: 9
Al-Muttaqi al-Hindi - Kanz al-‘Ummal fi Sunan al-Aqwal wal-Af'al
Volume: (11) - Hadith Number: (627)
33058 - O Ali, you are their genius.

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Reference: Kanz al-Ummaal fi Sunan al-Aqwaal wa al-Af'aal Book 11 Tradition No. 627

Hadith No: 10
Ibn Abd al-Barr - Al-Isti'ab fi Ma'rifat al-Ashaab - Supplement to the Letter 'Ayn - Chapter on Ali
1855 - Ali ibn Abi Talib (ra) ibn Abd al-Muttalib ibn Hashim ibn Abd Manaf ibn Qusayy al-Qurashi al-Hashimi
Volume: (3) - Page Number: (1104)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... He said: And Yahya ibn Ma'in informed us, saying: Abdah ibn Suleiman narrated to us from Abdul-Malik ibn Abi Suleiman, who said: I said to Ata: Was there anyone among the companions of Muhammad (peace be upon him and his holy progeny) more knowledgeable than Ali? He replied: No, by Allah, I do not believe anyone was.
- .... Khallaf ibn Qasim narrated to us, saying: Abdullah ibn Umar al-Jawhari narrated to us, who said: Ahmad ibn Muhammad ibn al-Hajjaj narrated to us, who said: Muhammad ibn al-Sari narrated to us by dictation in Egypt in the year 224 AH, saying: Amr ibn Hashim al-Janbi narrated to us, who said: Juwaybir narrated to us from Dhuhak ibn Muzahim from Abdullah ibn Abbas, who said: "By Allah, Ali ibn Abi Talib was given nine-tenths of knowledge, and I swear by Allah, he shared with you in the tenth part."

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Reference: Al-isteaab fi ma'refat al-ashaab Book 3

Hadith No: 11
Ibn Asakir - Tarikh Damishq (History of Damascus) - Letter 'Ayn
4933 - Ali ibn Abi Talib, whose name was Abd Manaf ibn Abd al-Muttalib ...
Volume: (42) - Page Number: (387)
[The text is lengthy, so only the relevant excerpt is provided here]
- Abu al-Qasim Zahir ibn Tahir narrated to us, saying: Abu Sa'd Ahmad ibn Ibrahim ibn Musa al-Muqri narrated to us, saying: Abu al-Hasan Ali ibn Muhammad ibn Sahl al-Masarjisi narrated to us, saying: Ahmad ibn Muhammad ibn Ziyat ibn Bashar narrated to us in Mecca, saying: Najih ibn Ibrahim Abu Muhammad al-Zuhri narrated to us, saying: Dharrar ibn Surad narrated to us, saying: al-Mu'tamitra ibn Sulayman narrated to us, who said: I heard my father mention from al-Hasan from Anas ibn Malik that the Prophet (peace be upon him and his holy progeny) said to Ali, "You will clarify to my Ummah what they will differ about after me."
- And Abu Talib ibn Abi Aqil narrated to us, saying: Abu al-Hasan al-Khal'ai narrated to us, saying: Abu Muhammad ibn al-Nahhas narrated to us, saying: Abu Sa'id ibn al-A'arabi narrated to us, saying: Najih ibn Muhammad ibn al-Hasan Abu Abd Allah al-Zuhri, the judge in Kufa, narrated to us, saying: Abu Nu'aym Dharrar ibn Surad narrated to us, saying: al-Mu'tamir ibn Sulayman al-Taymi narrated to us, who said: I heard my father mention from al-Hasan from Anas that the Prophet (peace be upon him and his holy progeny) said to Ali, "You will clarify to my Ummah what they will differ about after me."

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Reference: Tarikh e Damishq Book 42

Hadith No: 12
Ibn al-Dimashqi - Jawaahir al-MaTaalib fiManaaQib al-Imaam 'Ali ibn Abi Taalib (peace be upon him)
Volume: (1) - Page Number: (194)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... And from Ata, who was asked: Was there anyone among the companions of Muhammad (peace be upon him and his holy progeny) more knowledgeable than Ali? He replied: I do not know of anyone.
- .... And from Ibn Abbas (may Allah be pleased with him), who said: By Allah, Ali was given nine-tenths of knowledge, and I swear by God that he shared with them in the tenth part.
- .... And from him, when the people asked him, saying: What kind of man was Ali? He replied: His belly was filled with knowledge and forbearance, strength, and resilience, along with his kinship to the Messenger of Allah (peace be upon him and his holy progeny). This was narrated by Imam Ahmad in al-Manaqib.

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Reference: Jawahir al-Matalib fi Manaqib al-Imam Ali Book 1