 أَبِی ره قَالَ حَدَّثَنِی سَعْدُ بْنُ عَبْدِ اللَّهِ یَرْفَعُهُ إِلَی هِشَامِ بْنِ سَالِمٍ قَالَ: قُلْتُ لِأَبِی عَبْدِ اللَّهِ ع سَبَّابَهٌ لِعَلِیٍّ ع قَالَ هُوَ وَ اللَّهِ حَلَالُ الدَّمِ لَوْ لَا أَنْ یَعُمَّ بِهِ بَرِیئاً قُلْتُ أَیُّ شَیْ ءٍ یَعُمُّ بِهِ بَرِیئاً قَالَ یُقْتَلُ مُؤْمِنٌ بِکَافِرٍ.
19. My father (rah) said: it was narrated to me by Sa’d b. Abdillah who raised it to Hisham b. Salim who said: The narrator asked Imam Ja’far Sadiq  about one who imprecates Ali . Imam  replied, “I swear by Allah that it is permissible to kill him however doing so should not become a cause of death of an innocent human.” The narrator asked, “How can it become a cause of the death of an innocent?” Imam  replied, “The death of that infidel should not be retaliated by the death of a believer.”