Al-Kāfi
Hadith 109 3ـ عَنْهُ عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ فَضَّالٍ عَمَّنْ رَوَاهُ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلام) قَالَ قَالَ رَسُولُ الله (صَلَّى اللهُ عَلَيْهِ وَآلِه) مَنْ عَمِلَ عَلَى غَيْرِ عِلْمٍ كَانَ مَا يُفْسِدُ أَكْثَرَ مِمَّا يُصْلِحُ.
3. It is narrated from him from Ahmad ibn Muhammad from ibn Faddal from the one he narrated from abu ‘Abdallah (a.s.) who has said the following. “Imam abu ‘Abdallah (a.s.) has said that the Holy Prophet said, ‘Those who work without knowledge they destroy more than what they gain.’”