question #1 Sahih Muslim Introduction 72, Introduction, Narration 71 : What guidance is provided regarding the reliability of hadith narrators?

‘I wrote to Shu’bah asking him about Abū Shaybah , a judge of Wāsit, so he wrote to me: ‘Do not write anything from him [of Ḥadīth] and tear up my letter [to you about this]’.