Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
muslim:i034al-Faḍl b. Sahl > Saʾalt Muʿallá al-Rāzī > Muḥammad b. Saʿīd > ʿAbbād > ʿĪsá b. Yūnus

Īsā bin Yūnus said: ‘I was at his door and Sufyān was with [Muhammad bin Sa’īd], then when he came out I asked [Sufyān] about him. So he informed me that he was a liar.’  

مسلم:i٠٣٤وَحَدَّثَنِي الْفَضْلُ بْنُ سَهْلٍ قَالَ سَأَلْتُ مُعَلًّى الرَّازِيَّ عَنْ مُحَمَّدِ بْنِ سَعِيدٍ الَّذِي رَوَى عَنْهُ عَبَّادٌ فَأَخْبَرَنِي عَنْ عِيسَى بْنِ يُونُسَ قَالَ

كُنْتُ عَلَى بَابِهِ وَسُفْيَانُ عِنْدَهُ فَلَمَّا خَرَجَ سَأَلْتُهُ عَنْهُ فَأَخْبَرَنِي أَنَّهُ كَذَّابٌ