Sunan An-Nasa'i - سنن النسائي
37. The Book of Fighting [The Prohibition of Bloodshed] - كتاب تحريم الدم
2) Chapter: The Gravity of the Sin of Shedding Blood
It was narrated that Abu 'Imran Al-Jawni said:
"Jundab said: 'So and so told me that the Messenger of Allah [SAW] said: The slain will bring his killer on the Day of Resurrection and will say: Ask him why he killed me. He will say: I killed him defending the kingdom of so and so.'" Jundab said: "So be careful.'"
2) باب تَعْظِيمِ الدَّمِ
أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدِ بْنِ تَمِيمٍ، قَالَ حَدَّثَنَا حَجَّاجٌ، قَالَ أَخْبَرَنِي شُعْبَةُ، عَنْ أَبِي عِمْرَانَ الْجَوْنِيِّ، قَالَ قَالَ جُنْدَبٌ حَدَّثَنِي فُلاَنٌ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ . قَالَ جُنْدَبٌ فَاتَّقِهَا . 85 " يَجِيءُ الْمَقْتُولُ بِقَاتِلِهِ يَوْمَ الْقِيَامَةِ فَيَقُولُ سَلْ هَذَا فِيمَ قَتَلَنِي فَيَقُولُ قَتَلْتُهُ عَلَى مُلْكِ فُلاَنٍ "