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.‏