Hadith No: 1
Ibn Hajar al-Asqalani - Tahrib al-Tahdib - Chapter on the letter Jim - Those Named Ja'far
Volume: (2) - Page Number: (103/104)
[The text is lengthy, so only the relevant excerpt is provided here]
156 - Bukh M 4 (Bukhari in al-Adab al-Mufrad, Muslim, and the four others) Ja'far ibn Ali ibn al-Husayn ibn Ali ibn Abi Talib al-Hashimi al-Alawi, Abu Abd Allah al-Madini al-Sadiq:
- Al-Darawardi said: Malik did not narrate from Ja'far until the matter of the Banu Abbas became evident.
- Mus'ab al-Zubayri said: Malik would not narrate from him until he added him to another.
- Ibn al-Madini said: Yahya ibn Sa'id was asked about him and replied: "I have some reservations about him, and Mujalid is preferred to me over him." Ishaq ibn Hakim said from Yahya ibn Sa'id: "He was not a liar."
- Sa'id ibn Abi Maryam said: Abu Bakr ibn Iyash was asked, "Malik, did you not hear from Ja'far, even though you met him?" He replied: "We asked him about the hadiths he spoke of. Was it something he heard?" He said: "No, but it is a narration we have transmitted from our fathers."
- Hamid ibn Sa'd ibn Abi Maryam said from Yahya: "I used to not ask Yahya ibn Sa'id about his narrations, and he said to me: 'Why do you not ask me about the narration of Ja'far ibn Muhammad?' I replied: 'I do not want it'..."
- Ibn Sa'd said: He was much of a narrator, but not one to be trusted, and he was considered weak.

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Reference: Tazheeb al Tahzeeb Book 2

Hadith No: 2
Ibn Taymiyyah - Minhaj as-Sunnah an-Nabawiyyah fi Naqd Kalam al-Shi'ah al-Qadariyyah
Chapter Three: On the Evidences Indicating the Imamate of Ali (ra) After the Messenger of Allah (sa)
Method Four: On the Evidences Indicating the Imamate of Ali Deduced from His Circumstances
The Rafi'di said: The third is that he was the most knowledgeable of people after the Messenger of Allah (sa).
Volume: (7) - Page Number: (533/534)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... In summary, none of these four imams learned any foundational principles of jurisprudence from Ja'far. However, they narrated hadiths from him as they did from others, and the hadiths of others are many times more than his, and there is no comparison between the hadith of az-Zuhri and his hadith in terms of either strength or quantity. Al-Bukhari had doubts about some of his hadiths when he heard that Yahya ibn Sa'id al-Qattan had made remarks about him, so he did not include them in his compilation.

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Reference: Minhaaj al-Sunnah Book 7

Hadith No: 3
Al-Mizzi - Tahdhib al-Kamal fi Asma' al-Rijal - Chapter on the letter Jeem - Those Named Ja'far and Ja'il
950 - Ja'far ibn Muhammad ibn Ali ibn al-Husayn ibn Ali ibn Abi Talib (peace be upon him)
Volume: (5) - Page Number: (74 > 75)
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950 - Bi-kh 'a: Ja'far ibn Muhammad ibn Ali ibn al-Husayn ibn Ali ibn Abi Talib al-Qurashi al-Hashimi Abu Abdillah al-Madani al-Sadiq:
- Abu Bakr ibn Abi Khaythama said from Mus'ab ibn Abdillah al-Zubayri: I heard al-Darawardi say: "Malik did not narrate from Ja'far until the matter of the Banu al-Abbas became apparent."
- Mus'ab said: Malik would not narrate from Ja'far ibn Muhammad until he included him with the last of those high-born, and then place him after them.
- And Salih ibn Ahmad ibn Hanbal said from Ali ibn al-Madini: Yahya ibn Sa'id was asked about Ja'far ibn Muhammad and said: "I have some reservations about him." I said, "What about Mujalid?" He replied, "Mujalid is preferable to him."
- And Muhammad ibn Amr ibn Nafi' said: Sa'id ibn al-Hakam ibn Abi Maryam narrated to us from Abu Bakr ibn Iyash that it was said to him: "Malik, did you not hear from Ja'far ibn Muhammad, although you were contemporaries?" He said, "We asked him about the hadiths he was narrating, and he replied, 'I did not hear them,' but it is a narration we received from our fathers."
- Ibn Abi Maryam added from Yahya: "I used to avoid asking Yahya ibn Sa'id about his narrations, but he said to me, 'Why do you not ask me about the hadith of Ja'far ibn Muhammad?' I replied, 'I do not want it.'"
- Yahya ibn Ma'in said: Hafs ibn Ghayath went out to Abadan, a place of ribat, and the Basrans gathered around him. They said to him, "Do not narrate to us about three: Ash'ath ibn Abd al-Malik, Amr ibn Ubayd, and Ja'far ibn Muhammad." He replied, "As for Ash'ath, he is for you, and I will leave him to you. As for Amr ibn Ubayd, you know him better. But Ja'far ibn Muhammad, if you were in Kufah, you would find yourselves on the receiving end of beaten sandals."

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Reference: Tahzeeb al-Kamaal fi Asmaa al-Rejaal Book 5

Hadith No: 4
Al-Dhahabi - Siyar A'lam al-Nubala' - Volume 5
117 - Ja'far ibn Muhammad ibn Ali al-Qurashi al-Hashimi
Volume: (6) - Page Number: (255 > 257)
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117 - Ja'far ibn Muhammad ibn Ali ibn al-Shahid Abi Abdillah, the fragrant flower of the Prophet (peace be upon him and his holy progeny) and his grandson, and beloved, Husayn ibn Amir al-Mu'minin Abi al-Hasan Ali ibn Abi Talib, Abd Manaf ibn Shaybah, who is Abd al-Muttalib ibn Hashim, whose name was 'Amr ibn Abd Manaf ibn Qusey, the Imam al-Sadiq, Sheikh of the Banu Hashim, Abu Abdillah al-Qurashi al-Hashimi al-Alawi al-Nabawi al-Madini, one of the notable figures:
- Mus'ab ibn Abdillah said: I heard al-Dararwardi say: Malik did not narrate from Ja'far until the emergence of the Abbasid matter.
- Mus'ab said: Malik used to include him with others.
- And Ali reported from Yahya ibn Sa'id, who said: Ja'far ibn Muhammad dictated to me the long narration, meaning one on Hajj, and then said: "I have some reservations about him, but I prefer Mujaild to him." I said, this is one of the missteps of Yahya al-Qattan; rather, the imams of this field unanimously agreed that Ja'far is more trustworthy than Mujaild, and they did not pay attention to Yahya's statement.
- Ibn Abi Maryam added from Yahya: I used to avoid asking Yahya ibn Sa'id about his narrations until he said: "Why do you not ask me about the narration of Ja'far?" I replied: "I do not want it."
- Then Yahya ibn Ma'in said: Hafs ibn Ghayath went out to Abadan, which is a place of ribat, and the Basrians gathered around him and said: "Do not narrate to us about three: Ash'ath ibn Abd al-Malik, Amr ibn Ubayd, and Ja'far ibn Muhammad." He replied: "As for Ash'ath, he is acceptable to you; as for Amr, you know him better; and as for Ja'far, if you were in Kufa, you would be chased away with beaten sandals."
- And I heard Abu Hatim say: "Ja'far should not be questioned about one like him." I said: Ja'far is trustworthy, truthful, not on the same level of certainty as Shu'bah, but he is more trustworthy than Suhayl and Ibn Ishaq, and he is comparable in reliability to Ibn Abi Dhi'b and others, and most of his narrations from his father are marasil (unattributed).

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Reference: Seyar A'laam al-Nobalaa Book 6

Hadith No: 5
Al-Dhahabi - Mizan al-I'tidal fi Naqd al-Rijal - Letter "J"
1519 - Ja'far ibn Muhammad ibn Ali ibn al-Husayn al-Hashimi ...
Volume: (1) - Page Number: (414/415)
[The text is lengthy, so only the relevant excerpt is provided here]
1519 - Ja'far ibn Muhammad ibn Ali ibn al-Husayn al-Hashimi, Abu Abdullah, one of the prominent imams:
- Al-Dhahabi said: A righteous man, truthful, of great status, whom al-Bukhari did not deem it necessary to rely upon.
- Yahya ibn Sa'id said: Mujalid was preferred over him in my view, but there is nothing against him.
- Mus'ab narrated from al-Darawardi, who said: Malik did not narrate from Ja'far until the matter of the Banu al-Abbas became apparent.
- Mus'ab ibn Abdullah said: Malik would not narrate from Ja'far until he could associate him with someone else.
- Ahmad ibn Sa'd ibn Abi Maryam said: I heard Yahya say: I used to avoid asking Yahya ibn Sa'id about Ja'far ibn Muhammad, but he said to me: Why do you not ask me about the hadith of Ja'far? I replied: I do not want it.
- Then he said: Hafs ibn Ghayath went out to Abadan, which is a place of ribat, and the Basrans gathered around him. They said: Do not narrate to us about three: Ash'ath ibn Abd al-Malik, Amr ibn Ubayd, and Ja'far ibn Muhammad. He replied: As for Ash'ath, he is for you, and I will leave him to you. As for Amr, you are more knowledgeable. And as for Ja'far, if you were in Kufa, I would take you with the beaten sandals.

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Reference: Meezaan al Aietedal fi Naqd al Rijal Book 1

Hadith No: 6
Al-Dhahabi - Tarikh al-Islam wa Wafat al-Mashayikh wa al-A'lam - Year: 141 - 160
Fifteenth Generation - Biographies of the People of This Generation in Alphabetical Order - Letter J
Volume: (9) - Page Number: (88 > 90)
[The text is lengthy, so only the relevant excerpt is provided here]

4 - Ja'far al-Sadiq: He was the son of Abu Ja'far Muhammad ibn Ali ibn al-Husayn ibn Ali ibn Abi Talib, the Imam, scholar, Abu Abdullah al-Hashimi al-Alawi al-Husayni al-Medini:
- Ali ibn al-Madini narrated from Yahya ibn Sa'id: "Mujalid is preferable to me over Ja'far ibn Muhammad." I say, al-Qattan did not support this opinion, for Ja'far is trustworthy, and Muslim accepted his narrations, while Mujalid is not a primary figure.
- Ibn Abi Khuthayma narrated to us: Mus'ab said: I heard al-Darawardi say, "Malik did not narrate from Ja'far until the emergence of the Abbasid cause."
- Then Mus'ab said, "He would not narrate from Ja'far ibn Muhammad until he grouped him with others among those obscure figures, and then place him after them."

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Reference: Taarikh al islaam wa wafyaat al mushaheer wal a'alaam Book 9

Hadith No: 7
Ibn Adi - Al-Kamil fi Dha'afa' al-Rijal - Those Named Ja'far
334 - Ja'far ibn Muhammad ibn Ali ibn al-Husayn ibn Ali ibn Abi Talib, a Medinan...
Volume: (2) - Page Number: (356/357)
[The text is lengthy, so only the relevant excerpt is provided here]

334 - Ja'far ibn Muhammad ibn Ali ibn al-Husayn ibn Ali ibn Abi Talib, a Medinan, was known by the kunyah Abu Abdillah:
- Al-Baqr ibn Iyash reported that it was said to him: "Why have you not heard from Ja'far ibn Muhammad, although you have met him?" He replied, "We asked him about the matters he speaks of in his narrations. Is there anything you heard him say?" He said, 'No, but it is a narration we received from our ancestors.'"
- Ali ibn al-Madini narrated to us: Yahya ibn Sa'id was asked about Ja'far ibn Muhammad and said, "I have some reservations about him." I said, "What about Mujalid?" He replied, "Mujalid is more preferable to me than him."
- Ahmad ibn Zuhayr ibn Harb narrated to us: I heard Mus'ab ibn Abd Allah al-Zubayri say: "I heard al-Darawardi say that Malik did not narrate from Ja'far ibn Muhammad until the matter of the Banu Abbas became evident."
- Ibn Hamad added: And I heard Mus'ab say: "Malik ibn Anas would not narrate from Ja'far ibn Muhammad until he included him with the last of those high-ranking individuals and then placed him after them."
- Ahmad ibn Sa'ad ibn Abi Maryam narrated to us, saying: I heard Yahya ibn Ma'in say, "I used to avoid asking Yahya ibn Sa'id about Ja'far ibn Muhammad's narrations, but he would say, 'Do not ask me about Ja'far ibn Muhammad.'" I replied, "I do not wish to ask about him."

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Reference: Ù“Al-Kaamil fi Dho'afaa al-Rijaal Book 2