The Book on Government
33/32. Chapter:
If a person is killed in the cause of Allah, all his sins will be expiated except debt
Sahih Muslim
وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يَزِيدَ الْمُقْرِئُ، حَدَّثَنَا سَعِيدُ بْنُ أَبِي، أَيُّوبَ حَدَّثَنِي عَيَّاشُ بْنُ عَبَّاسٍ الْقِتْبَانِيُّ، عَنْ أَبِي عَبْدِ الرَّحْمَنِ الْحُبُلِيِّ، عَنْ عَبْدِ اللَّهِ بْنِ، عَمْرِو بْنِ الْعَاصِ أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " الْقَتْلُ فِي سَبِيلِ اللَّهِ يُكَفِّرُ كُلَّ شَىْءٍ إِلاَّ الدَّيْنَ " .
It has been reported on the authority of Amr b. al-'As through a different chain of transmitters that the Messenger of Allah (ﷺ) said: Death in the way of Allah blots out everything except debt.
Reference : Sahih Muslim 1886bIn-book reference : Book 33, Hadith 180USC-MSA web (English) reference : Book 20, Hadith 4650