Hadith #4008 (Sunan al-Nasa'i)
Book: The Book of Fighting [The Prohibition of Bloodshed]
Narrator(s): Abdur Rahman bin Ishaq عبد الرحمن بن إسحاق بن عبد الله, Abu al-Zanad أبو الزناد, Amr bin 'Ali bin Bahr al-Bahli عمرو بن علي بن بحر الباهلي, Hammad bin Salama حماد بن سلمة, Kharija ibn Zayd ibn Thabit خارجة بن زيد بن ثابت الأنصاري, Mjald bin Awf مجالد بن عوف, Muslim bin Ibrahim al-Azdy مسلم بن إبراهيم الأزدي الفراهيدي, Zayd ibn Thabit

“Jundab said: ‘So and so told me that the Messenger of Allah  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.'”

Source: https://parallelquran.com/hadith/sunan-al-nasai-4008/

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Hadith #4271 (Sunan Abi Dawud)
Book: Trials and Fierce Battles (Kitab Al-Fitan Wa Al-Malahim)
Narrator(s): Abdur Rahman bin Ishaq عبد الرحمن بن إسحاق بن عبد الله, Abu al-Zanad أبو الزناد, Hammad bin Zayd حماد بن زيد بن درهم الأزدي الأزرق, Mjald bin Awf مجالد بن عوف, Muslim bin Ibrahim al-Azdy مسلم بن إبراهيم الأزدي الفراهيدي, Zayd ibn Thabit
Grade: Sahih

I asked Yahya b. Yahya al-Ghassani about the word i’tabata bi qatlihi spoken by him (as mentioned in the previous tradition). He said: It means those people who fight during the period of commotion (fitnah), and one of them kills (the other people) presuming that he is in the right, so he does not beg pardon of Allah of that (sin).
Abu Dawud said: And he said: The word fa’tabata means “he shed blood profusely”

Source: https://parallelquran.com/hadith/sunan-abi-dawud-4271/