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 [SAW] said: 'The first matter concerning which judgment will be passed among the people will be bloodshed.'" Translation Not Available

Book Ref: Sunan An Nisai Book 37 Hadith 3992
Web Ref:  Sunan An Nisai Vol 5 Book 37 Hadith 3997