question #1 Sahih Muslim Introduction 92, Introduction, Narration 91 : What criteria are used to assess the reliability of hadith narrators?

‘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’.’