حَدَّثَنَا حَسَنُ بْنُ عَلِيٍّ الْحُلْوَانِيُّ، حَدَّثَنَا يَحْيَى بْنُ آدَمَ، حَدَّثَنَا ابْنُ إِدْرِيسَ، عَنِ الْأَعْمَشِ، عَنْ أَبِي إِسْحَاقَ، قَالَ: لَمَّا أَحْدَثُوا تِلْكَ الْأَشْيَاءَ بَعْدَ عَلِيٍّ رَضِيَ اللَّهُ عَنْهُ، قَالَ رَجُلٌ مِنْ أَصْحَابِ عَلِيٍّ: «قَاتَلَهُمُ اللَّهُ، أَيَّ عِلْمٍ أَفْسَدُوا!».
Translation: Ḥasan ibn ʿAlī al-Ḥulwānī narrated to us; Yaḥyā ibn Ādam narrated to us; Ibn Idrīs narrated to us, from al-Aʿmash, from Abū Isḥāq, who said: “When those things were introduced after ʿAlī, may Allah be pleased with him, one of ʿAlī’s companions said, ‘May Allah contend with them! What knowledge they have corrupted!’”
“Qātalahum Allāh” is a vehement imprecatory expression here, not a judicial command to fight. The statement is attributed to a companion of ʿAlī, not directly to the Prophet; its force is condemnation of corrupt transmission.