Hadith 46291

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.

Source: Mishkat al-Masabih — repository translation · Al-Khatib Al-Tabrizi — authenticity/grade metadata requires independent source review · Sunnah.com
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Source: Mishkat al-Masabih — repository arabic · Al-Khatib Al-Tabrizi · Sunnah.com