Sunan Ibn Majah, Hadith 2617 ⓘ
It was narrated from Abdullah that the Messenger of Allah said: The first matter concerning which judgment will be passed among the people on the Day of Resurrection will be bloodshed.”
حَدَّثَنَا سَعِيدُ بْنُ يَحْيَى بْنِ الأَزْهَرِ الْوَاسِطِيُّ، حَدَّثَنَا إِسْحَاقُ بْنُ يُوسُفَ الأَزْرَقُ، عَنْ شَرِيكٍ، عَنْ عَاصِمٍ، عَنْ أَبِي وَائِلٍ، عَنْ عَبْدِ اللَّهِ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " أَوَّلُ مَا يُقْضَى بَيْنَ النَّاسِ يَوْمَ الْقِيَامَةِ فِي الدِّمَاءِ " .
also referenced under: Book 21, Hadith 2715 (In-Book) & Volume 3, Book 21, Hadith 2617 (DarusSalam)