This is a good, authentic (ḥasan gharīb) hadith; we do not know it except through this chain.

‌‌97 - The Virtues of Jaʿfar ibn Abī Ṭālib, the Brother of ʿAlī, may Allah be pleased with him

4096 - ʿAlī ibn Ḥujr narrated to us, saying: ʿAbdullāh ibn Jaʿfar informed us, from al-ʿAlāʾ ibn ʿAbd al-Raḥmān, from his father, from Abū Hurayrah, who said: The Messenger of Allah, peace and blessings be upon him, said: "I saw Jaʿfar flying in Paradise with the angels."

This is a gharīb hadith from the narrations of Abū Hurayrah; we do not know it except through the narration of ʿAbdullāh ibn Jaʿfar. Yaḥyā ibn Maʿīn and others have declared ʿAbdullāh ibn Jaʿfar weak, and he is the father of ʿAlī ibn al-Madīnī.

On this topic, there is also a narration from Ibn ʿAbbās.

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= Also narrated by al-Khaṭīb in his "Tārīkh" 11/24, Ibn al-Jawzī in "al-ʿIlal al-Mutanāhiyah" (465), and al-Mizzī in "Tahdhīb al-Kamāl" 18/514.

(1) The hadith is authentic (ṣaḥīḥ) through its various chains and supporting witnesses, though this particular chain is weak due to the weakness of ʿAbdullāh ibn Jaʿfar al-Madīnī. It is found in "Ṣaḥīḥ Ibn Ḥibbān" (7047).

It is supported by the hadith of Ibn ʿUmar in al-Bukhārī (3709), whose wording is: that Ibn ʿUmar, when he greeted Ibn Jaʿfar, would say: "Peace be upon you, O son of the one with two wings."

And the hadith of Ibn ʿAbbās in al-Ṭabarānī's "al-Kabīr" (1466) and (1467), and al-Ḥākim 3/209.