Sunan An-Nasa'i

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