Man Lā Yaḥḍuruh al-Faqīh
Hadith 2225190 - وَ رَوَى اَلْحَسَنُ بْنُ مَحْبُوبٍ عَنْ عَلِيِّ بْنِ رِئَابٍ عَنْ أَبِي بَصِيرٍ قَالَ: سَأَلْتُ أَبَا جَعْفَرٍ عَلَيْهِ اَلسَّلاَمُ عَنْ رَجُلٍ قَتَلَ مَجْنُوناً قَالَ إِنْ "كَانَ أَرَادَهُ فَدَفَعَهُ عَنْ نَفْسِهِ فَقَتَلَهُ فَلاَ شَيْءَ عَلَيْهِ مِنْ قَوَدٍ وَ لاَ دِيَةٍ وَ يُعْطَى وَرَثَتُهُ دِيَتَهُ مِنْ بَيْتِ مَالِ اَلْمُسْلِمِينَ " قَالَ "فَإِنْ كَانَ قَتَلَهُ مِنْ غَيْرِ أَنْ يَكُونَ اَلْمَجْنُونُ أَرَادَهُ فَلاَ قَوَدَ لِمَنْ لاَ يُقَادُ مِنْهُ وَ أَرَى أَنَّ عَلَى قَاتِلِهِ اَلدِّيَةَ فِي مَالِهِ يَدْفَعُهَا إِلَى وَرَثَةِ اَلْمَجْنُونِ وَ يَسْتَغْفِرُ اَللَّهَ عَزَّ وَ جَلَّ وَ يَتُوبُ إِلَيْهِ".
Hadith.5190 - Al-Hasan ibn Mahbub narrated from Ali ibn Ri'ab from Abu Basir, who said:
I asked Abu Jafar Imam Muhammad ibn Ali Al-Baqir (as) about a man who killed a mentally ill person.
Imam (as) said: "If the mentally ill person had intended to harm him and the man defended himself and killed him, then there is neither retribution (qisas) nor blood money (diyyah) upon him. However, his heirs should be given the blood money from the public treasury (Bayt Al-Mal) of the Muslims."
Imam (as) further said: "But if the man killed him without the mentally ill person intending to harm him, then there is no retribution for someone who cannot be avenged, but I believe that the killer must pay the blood money from his own wealth to the heirs of the mentally ill person.
He must also seek forgiveness from Allah (swt), the Almighty and Majestic, and repent to Him (swt)."