Hadith 8:149
‘Abdallah b. ‘Amr reported God’s Messenger as saying, “Every fault but a debt will be forgiven to a martyr.” Muslim transmitted it.
وَعَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «يُغْفَرُ لِلشَّهِيدِ كل ذَنْب إِلَّا الدّين» . رَوَاهُ مُسلم
Original Reference: Mishkat al-Masabih 2912