Muslim said, “Reliable.”
Al-Dāraquṭnī said, “Reliable and distinguished.” (1)
Al-Nasāʾī remarked, “There is nothing objectionable about him.”

Makkī ibn ʿAbdān related: “I heard Aḥmad ibn Yūsuf say, ‘I wrote down thirty thousand hadiths from ʿUbayd Allāh ibn Mūsā.’”

Abū Ḥāmid ibn al-Sharqī stated: “Aḥmad ibn Yūsuf died in 264 AH.”
Abū Saʿīd the muʾadhdhin reported from his father that he died in 263 AH.

Al-Ḥākim said: “I read, in the handwriting of Abū ʿAmr al-Mustamlī: ‘I heard Ḥamdan al-Sulamī, and the people said to him, “Let us hear [narrations from you].” He replied, “I cannot; I am eighty years old,” and that was in mid-Shawwāl of 262 AH.’”
I comment: They had asked him to dictate hadiths directly, but he excused himself, being unable to address such a large assembly.

Abū Isḥāq al-Muzakkī said: “I heard al-ʿAbbās ibn al-Faḍl say: ‘I heard Aḥmad ibn Yūsuf say: “I heard ʿAbd al-Razzāq say: ‘I heard Sufyān al-Thawrī say:
I left the presence of that man—meaning al-Mahdī—and did not greet him with the title of leadership. He looked at me, smiled, and said, “We have been seeking you but you eluded us; now Allah has brought you here. Present your request.”
I said, “You have filled the land with oppression and injustice; so fear Allah, and let your case serve as a lesson.”
He lowered his head and then asked, “What if I am unable to do that?!”
I replied, “Then flee with your faith.”’”’”