حَدَّثَنَا عَبْدُ اللَّهِ بْنُ عَبْدِ الرَّحْمَنِ الدَّارِمِيُّ، أَخْبَرَنَا زَكَرِيَّاءُ بْنُ عَدِيٍّ، قَالَ: قَالَ لِي أَبُو إِسْحَاقَ الْفَزَارِيُّ: اكْتُبْ عَنْ بَقِيَّةَ مَا رَوَى عَنِ الْمَعْرُوفِينَ، وَلَا تَكْتُبْ عَنْهُ مَا رَوَى عَنْ غَيْرِ الْمَعْرُوفِينَ، وَلَا تَكْتُبْ عَنْ إِسْمَاعِيلَ بْنِ عَيَّاشٍ مَا رَوَى عَنِ الْمَعْرُوفِينَ وَلَا عَنْ غَيْرِهِمْ.
Translation: ʿAbd Allāh al-Dārimī transmits al-Fazārī’s instruction: record Baqiyyah’s transmissions from known narrators, not from unknown ones; do not record Ismāʿīl b. ʿAyyāsh’s transmissions from either group.
This is al-Fazārī’s particular critical advice, not by itself a consensus of all specialists. For Baqiyyah, knowing the identity of the person from whom he transmitted is central to the instruction.