If a person is killed in the cause of Allah, all his sins will be expiated except debt Sahih Muslim 1886 a
Arabic hadith text
حَدَّثَنَا زَكَرِيَّاءُ بْنُ يَحْيَى بْنِ صَالِحٍ الْمِصْرِيُّ، حَدَّثَنَا الْمُفَضَّلُ، - يَعْنِي ابْنَ فَضَالَةَ
- عَنْ عَيَّاشٍ، - وَهُوَ ابْنُ عَبَّاسٍ الْقِتْبَانِيُّ - عَنْ عَبْدِ اللَّهِ بْنِ يَزِيدَ أَبِي عَبْدِ الرَّحْمَنِ الْحُبُلِيِّ،
عَنْ عَبْدِ اللَّهِ بْنِ عَمْرِو بْنِ الْعَاصِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ "يُغْفَرُ لِلشَّهِيدِ
كُلُّ ذَنْبٍ إِلاَّ الدَّيْنَ "
Translation
It has been reported on the authority of 'Amr b. al-'As that the Messenger of Allah (ﷺ) said
All the sins of a Shahid (martyr) are forgiven except debt.