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)
عَنْ عَبْدِ اللهِ وَأَبِي مُوسَى الْأَشْعَرِيِّ قَالَا قَالَ رَسُولُ اللهِ ﷺ إِنَّ بَيْنَ يَدَيِ السَّاعَةِ أَيَّامًا يُرْفَعُ فِيهِنَّ الْعِلْمُ وَيَنْزِلُ فِيهِنَّ الْجَهْلُ وَيَكْثُرُ فِيهِنَّ الْهَرْجُ قَالَ وَالْهَرْجُ الْقَتْلُ