I say: He is trustworthy. It was also narrated by Ḥabīb ibn Ḥabīb, the brother of Ḥamzah al-Zayyāt, from Abū Isḥāq, from ʿAmr ibn Dhī Murr and Zayd ibn Arqam, who said: The Messenger of Allah, peace and blessings be upon him, delivered a sermon on the day of Ghadīr Khumm and mentioned it, adding: “... and support whoever supports him, and aid whoever aids him.” Al-Ṭabarānī recorded it in al-Muʿjam al-Kabīr (5059). This Ḥabīb is weak, as al-Haythamī said (9/108).

ʿAbdullāh ibn Aḥmad recorded in his additions to al-Musnad (1/118), from Saʿīd ibn Wahb and Zayd ibn Yathīʿ, who said: ʿAlī appealed to the people at al-Raḥbah: “Whoever heard the Messenger of Allah, peace and blessings be upon him, say this on the day of Ghadīr Khumm, let him stand.” Six men on Saʿīd’s side and six on Zayd’s side then stood and testified ... the hadith. It has already been cited under the fourth hadith, through the second and third routes. Its chain of transmission is good, and al-Bazzār narrated it similarly, but more completely.

The hadith has many other routes. Al-Haythamī collected a large number of them in al-Majmaʿ (9/103–108). I have cited and traced as many of them as I was able; after closely examining their chains of transmission, anyone who considers them will be decisively certain of the hadith’s authenticity. Moreover, they are extremely numerous. Ibn ʿUqdah collected them exhaustively in a separate work. Al-Ḥāfiẓ Ibn Ḥajar said: “Among them are authentic reports and good reports.”

In sum, the hadith under discussion is authentic in both its parts. Indeed, its first part is mass-transmitted from him, peace and blessings be upon him, as becomes clear to anyone who follows its chains and routes. What I have mentioned is sufficient. As for the wording in the fifth route of ʿAlī’s hadith, may Allah be pleased with him: “And support whoever supports him, and forsake whoever forsakes him.”