question #3 Sahih Muslim Introduction 86, Introduction, Narration 85 : What measures are taken in Islamic scholarship to verify the authenticity of hadith narrators?

‘Yahyā bin Ma’īn narrated to me, Hajjāj narrated to us, Ibn Abī Dhi’b narrated to us on authority of Shurahbīl bin Sa’d , and he was imputed [with lying regarding Ḥadīth near the end of his life]’.