سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 3992
The Book of Fighting [The Prohibition of Bloodshed]
The Gravity of the Sin of Shedding Blood
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، عَنْ خَالِدٍ، حَدَّثَنَا شُعْبَةُ، عَنْ سُلَيْمَانَ، قَالَ سَمِعْتُ أَبَا وَائِلٍ، يُحَدِّثُ عَنْ عَبْدِ اللَّهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ أَوَّلُ مَا يُحْكَمُ بَيْنَ النَّاسِ فِي الدِّمَاءِ .
It was narrated that 'Abdullah said: "The Messenger of Allah [ﷺ] said: 'The first matter concerning which judgment will be passed among the people will be bloodshed.'"
Sunan an-Nasa'i, 3992Sahih (Darussalam)