1. [1/265] Rijal al-Kashshi: Muhammad b. Qulawayh and al-Husayn b. al-Hasan b. Bundar al-Qummi from Sa’d b. Abdallah from Muhammad b. Isa b. Ubayd from Yunus b. Abd al-Rahman: One of our companions asked him [Yunus] while I [Muhammad b. Isa b. Ubayd] was present saying: O Aba Muhammad – how stringent you are in the matter of Hadith and how great is your repudiation of what is narrated by our companions – so what leads you to reject the narrations? He [Yunus] said: Hisham b. al-Hakam narrated to me that he heard Aba Abdillah عليه السلام saying:

Do not accept a Hadith on our authority except that which agrees with the Qur’an and the Sunna or you find for it a witness [corroboration] from our past narrations, for al-Mughira b. Said – may Allah curse him – has interpolated into the books of the companions of my father [i.e. al-Baqir عليه السلام] narrations which were not narrated by my father. Therefore fear Allah, and do not accept on our authority that which opposes the words of our Lord the Exalted and the Sunna of our prophet صلى الله عليه و آله …