'Abdullah Ibn Mas’ud (RAA) narrated that The Messenger of Allah (ﷺ) said:

“The first issues to be judged among people on the Day of Resurrection, are those of unlawful blood-shed.” Agreed upon.

وَعَنْ عَبْدِ اَللَّهِ بْنِ مَسْعُودٍ ‏- رضى الله عنه ‏- قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ أَوَّلُ مَا يُقْضَى بَيْنَ اَلنَّاسِ يَوْمَ اَلْقِيَامَةِ فِي اَلدِّمَاءِ .‏ } مُتَّفَقٌ عَلَيْهِ [1]‏ .‏