سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 3993
The Book of Fighting [The Prohibition of Bloodshed]
The Gravity of the Sin of Shedding Blood
أَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنَا أَبُو دَاوُدَ، عَنْ سُفْيَانَ، عَنِ الأَعْمَشِ، عَنْ أَبِي وَائِلٍ، قَالَ قَالَ عَبْدُ اللَّهِ أَوَّلُ مَا يُقْضَى بَيْنَ النَّاسِ يَوْمَ الْقِيَامَةِ فِي الدِّمَاءِ .
It was narrated from 'Abdullah that: The Messenger of Allah [ﷺ] said: "The first matter concerning which scores will be settled among the people on the Day of Resurrection will be bloodshed."
Sunan an-Nasa'i, 3993Sahih (Darussalam)