Sahih al-Bukhari 6533
Book 81: To make the Heart Tender (Ar-Riqaq) · Narrated by `Abdullah
Arabic
حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، حَدَّثَنِي شَقِيقٌ، سَمِعْتُ عَبْدَ اللَّهِ ـ رضى الله عنه ـ قَالَ النَّبِيُّ صلى الله عليه وسلم " أَوَّلُ مَا يُقْضَى بَيْنَ النَّاسِ بِالدِّمَاءِ ".
English translation
Narrated `Abdullah:The Prophet (ﷺ) said, "The cases which will be decided first (on the Day of Resurrection) will be the cases of blood-shedding
Reference: Sahih al-Bukhari 6533, Book of To make the Heart Tender (Ar-Riqaq). English translation by Dr. Muhammad Muhsin Khan.