Bishr bin al-Hakam narrated to me, he said, I heard Yahyā bin Sa’īd al-Qattān weaken Hakīm bin Jubayr and Abd al-A’lā; and he weakened Yahyā Mūsā bin Dīnār [there is no ‘bin’ between ‘Yahyā’ and ‘Mūsā’]; [Yahyā] said
‘His Ḥadīth are Rīh or ‘wind’ [i.e., not established and weak]. [Yahyā] weakened Mūsā bin Dihqān and Īsā bin Abī Īsā al-Madanī. [Muslim] said, ‘I heard al-Hasan bin Īsā saying ‘Ibn al-Mubārak said to me: ‘When you go to Jarīr then write down all of his knowledge except the Ḥadīth of 3 [people] - do not write the Ḥadīth of Ubaydah bin Mu’attib, as-Sarī bin Ismā’īl, or Muhammad bin Sālim’.’ Muslim said: Similar instances to what we mentioned from the words of Ahl ul-Ilm regarding those transmitters who are imputed in Ḥadīth, and reports about their defects, are great in number, it would lengthen this book to mention its investigation, and what we [already] mentioned should be sufficient for whoever reflects upon and understands the way of the people [Muhaddithīn] in terms of what they said and clarified of all of that. Indeed [the Muhaddithīn] concerned themselves with the unveiling of the defects of transmitters of Ḥadīth and narrators of reports; they delivered verdicts in that at the time they were asked when there was a great danger involved considering that the reports are regarding affairs of the Dīn; whether [the transmissions] present a permission or proscription, a command or prohibition, encouragement or admonition. If the transmitter for it is not a source of truthfulness or reliability, then those who know [his condition], who risk transmitting on his authority, and not declaring [his condition] to others whom are ignorant of his [state], are sinning through doing that, and deceiving the common Muslims, since he should not feel secure in that some of those who heard these reports will act upon them, or act upon some of them, and perhaps they are lies which have no basis, or a majority of them; this along with the fact that authentic reports from the trustworthy chains and the people who are satisfactory [to the majority of Ahl ul-Ilm] are in too great a number to compel relating from those who are not trustworthy and who are not satisfactory.