Among those who narrated from him were: Ahmad ibn Hanbal, Yahya ibn Maʿin, Abu Khaythamah, Abu Maʿmar al-Qatiʿi, Mujahid ibn Musa, Muhammad ibn Abi Ghalib al-Qumisi, Muhammad ibn ʿAbd Allah al-Mukharrimi, and Muhammad ibn Saʿdan the Qur’an reciter.

Muhanna ibn Yahya related on the authority of Ahmad ibn Hanbal, who said:
“I know of no one more reliable in the narrations of Zuhayr than al-Ashyab—apart from Abu Kamil Muzaffar, for he was even more reliable than al-Ashyab.” (1)

Abu Dawud also transmitted from Ahmad—mentioning Abu Kamil—who remarked, “None of them is his equal.”

ʿAbd Allah ibn Ahmad reported from his father that he said:
“The hadith scholars of Baghdad were Abu Kamil, Abu Salamah al-Khuzaʿi, and al-Haytham ibn Jamil. Al-Haytham possessed the strongest memory among them, while Abu Kamil was the most precise in hadith.” (2)

Abu Talib likewise narrated from Ahmad, who stated:
“Abu Salamah al-Khuzaʿi, al-Haytham, and Abu Kamil were all keenly versed in hadith and in assessing narrators; they would write only from trustworthy transmitters. Abu Kamil was accurate and perceptive in hadith, unpretentious among people; he never spoke unless questioned, whereupon he would answer or remain silent. He had sound judgment. Al-Haytham had the best memory of them, while Abu Salamah was one of the most knowledgeable people regarding historical events; ask him about anyone and he would furnish you with information, and he also engaged in juristic study.” (3)

Ahmad ibn Hanbal said:
“On one occasion they all agreed that Abu Kamil should pose a question to Sharik. I spoke to Sharik in Baghdad, and he replied, ‘When he came out they followed him’—or words to that effect.
So they were content with him, and he was—”