Sunan An-Nasa'i - سنن النسائي
37. The Book of Fighting [The Prohibition of Bloodshed] - كتاب تحريم الدم
25) Chapter: The One Who Fights to Protect Himself Against Injustice
It was narrated that Abu Ja'far said:
"I was sitting with Suwaid bin Muqarrin, and he said: The Messenger of Allah [SAW] said: "Whoever is killed defending himself against injustice, he is a martyr."
25) باب مَنْ قَاتَلَ دُونَ مَظْلَمَتِهِ
أَخْبَرَنَا الْقَاسِمُ بْنُ زَكَرِيَّا بْنِ دِينَارٍ، قَالَ حَدَّثَنَا سَعِيدُ بْنُ عَمْرٍو الأَشْعَثِيُّ، قَالَ حَدَّثَنَا عَبْثَرٌ، عَنْ مُطَرِّفٍ، عَنْ سَوَادَةَ بْنِ أَبِي الْجَعْدِ، عَنْ أَبِي جَعْفَرٍ، قَالَ كُنْتُ جَالِسًا عِنْدَ سُوَيْدِ بْنِ مُقَرِّنٍ فَقَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم . " مَنْ قُتِلَ دُونَ مَظْلَمَتِهِ فَهُوَ شَهِيدٌ "