The Prophet ﷺ said, "Near the establishment of the Hour there will be days during which Religious ignorance will spread, knowledge will be taken away (vanish) and there will be much Al-Harj, and Al- Harj means killing."
كُنْتُ مَعَ عَبْدِ اللَّهِ وَأَبِي مُوسَى فَقَالاَ قَالَ النَّبِيُّ ﷺ إِنَّ بَيْنَ يَدَىِ السَّاعَةِ لأَيَّامًا يَنْزِلُ فِيهَا الْجَهْلُ وَيُرْفَعُ فِيهَا الْعِلْمُ وَيَكْثُرُ فِيهَا الْهَرْجُ وَالْهَرْجُ الْقَتْلُ