Sahih al-Bukhari, Volume 9, Book 88, Hadith 185 (USC-MSA) ⓘ
Narrated Abu Musa: The Prophet said, "Near the establishment of the Hour there will be days during which (religious) knowledge will be taken away (vanish) and general ignorance will spread, and there will be Al-Harj in abundance, and Al-Harj means killing."
حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، حَدَّثَنَا شَقِيقٌ، قَالَ جَلَسَ عَبْدُ اللَّهِ وَأَبُو مُوسَى فَتَحَدَّثَا فَقَالَ أَبُو مُوسَى قَالَ النَّبِيُّ صلى الله عليه وسلم " إِنَّ بَيْنَ يَدَىِ السَّاعَةِ أَيَّامًا يُرْفَعُ فِيهَا الْعِلْمُ، وَيَنْزِلُ فِيهَا الْجَهْلُ، وَيَكْثُرُ فِيهَا الْهَرْجُ، وَالْهَرْجُ الْقَتْلُ " .
also referenced under: Book 92, Hadith 15 (In-Book) & Hadith 7064 (DarusSalam)