I was sitting with 'Abdullah and Abu Musa that they reported Messenger of Allah ﷺ having said: Prior to the Last Hour, there would be a time when knowledge would be taken away, and ignorance would take its place and there would be bloodshed on a large scale. (Using translation from Muslim 2672a)
كُنْتُ جَالِسًا مَعَ عَبْدِ اللهِ وَأَبِي مُوسَى فَقَالَا قَالَ رَسُولُ اللهِ ﷺ إِنَّ بَيْنَ يَدَيِ السَّاعَةِ أَيَّامًا يَنْزِلُ فِيهَا الْجَهْلُ وَيُرْفَعُ فِيهَا الْعِلْمُ وَيَكْثُرُ فِيهَا الْهَرْجُ قَالَ قُلْنَا وَمَا الْهَرْجُ؟ قَالَ الْقَتْلُ