كتاب الفتن وأشراط الساعة
54  
The Book of Tribulations and Portents of the Last Hour
(18)
Chapter: The Hour Will Not Begin Until A Man Passes By Another Man's Grave And Wishes That He Was In The Place Of The Deceased, Because Of Calamity
(18)
بَاب لَا تَقُومُ السَّاعَةُ حَتَّى يَمُرَّ الرَّجُلُ بِقَبْرِ الرَّجُلِ فَيَتَمَنَّى أَنْ يَكُونَ مَكَانَ الْمَيِّتِ مِنْ الْبَلَاءِ
Sahih Muslim 2908 a

Abu Huraira reported Allah's Messenger (ﷺ) as saying:

By Him in Whose Hand is my life, a time would come when the murderer would not know why he has committed the murder, and the victim would not know why he has been killed.
وَحَدَّثَنَا ابْنُ أَبِي عُمَرَ الْمَكِّيُّ، حَدَّثَنَا مَرْوَانُ، عَنْ يَزِيدَ، - وَهُوَ ابْنُ كَيْسَانَ - عَنْ أَبِي حَازِمٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏ "‏ وَالَّذِي نَفْسِي بِيَدِهِ لَيَأْتِيَنَّ عَلَى النَّاسِ زَمَانٌ لاَ يَدْرِي الْقَاتِلُ فِي أَىِّ شَىْءٍ قَتَلَ وَلاَ يَدْرِي الْمَقْتُولُ عَلَى أَىِّ شَىْءٍ قُتِلَ ‏"‏ ‏.‏
Reference : Sahih Muslim 2908a
In-book reference : Book 54, Hadith 69
USC-MSA web (English) reference : Book 41, Hadith 6949
  (deprecated numbering scheme)