Mishkat al-Masabih #3330
Retaliation
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْهُ عَنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «كُلُّ ذَنْبٍ عَسَى اللَّهُ أَنْ يَغْفِرَهُ إِلَّا مَنْ مَاتَ مُشْرِكًا أَوْ مَنْ يقتُلُ مُؤمنا مُتَعَمدا» . رَوَاهُ أَبُو دَاوُد
وَرَوَاهُ النَّسَائِيّ عَن مُعَاوِيَة
He reported God’s Messenger as saying, “God may forgive every sin, except in the case of one who dies a polytheist, or one who purposely kills a believer.”
Abu Dawud transmitted it, and Nasa’i transmitted it on the authority of Mu'awiya.
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About Mishkat al-Masabih
This hadith is #3330 from Mishkat al-Masabih, in the Book of Retaliation.