Language:
كتاب الفتن
92  
Afflictions and the End of the World
(5)
Chapter: The appearance of Al-Fitan
(5)
باب ظُهُورِ الْفِتَنِ
Sahih al-Bukhari 7066

Narrated `Abdullah:

The Prophet (ﷺ) said, "Near the establishment of the Hour, there will be the days of Al-Harj, and the religious knowledge will be taken away (vanish i.e. by the death of Religious scholars) and general ignorance will spread." Abu Musa said, "Al-Harj, in the Ethiopian language, means killing."

حَدَّثَنَا مُحَمَّدٌ، حَدَّثَنَا غُنْدَرٌ، حَدَّثَنَا شُعْبَةُ، عَنْ وَاصِلٍ، عَنْ أَبِي وَائِلٍ، عَنْ عَبْدِ اللَّهِ، وَأَحْسِبُهُ، رَفَعَهُ قَالَ ‏ "‏ بَيْنَ يَدَىِ السَّاعَةِ أَيَّامُ الْهَرْجِ، يَزُولُ الْعِلْمُ، وَيَظْهَرُ فِيهَا الْجَهْلُ ‏"‏‏.‏ قَالَ أَبُو مُوسَى وَالْهَرْجُ الْقَتْلُ بِلِسَانِ الْحَبَشَةِ‏.‏
Reference : Sahih al-Bukhari 7066
In-book reference : Book 92, Hadith 17
USC-MSA web (English) reference : Vol. 9, Book 88, Hadith 187
  (deprecated numbering scheme)