حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، وَمُحَمَّدُ بْنُ الصَّبَّاحِ، قَالاَ حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ أَبِي حَازِمٍ، حَدَّثَنِي أَبِي، عَنْ عُمَارَةَ بْنِ حَزْمٍ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو، أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ قَالَ ‏"‏ كَيْفَ بِكُمْ وَبِزَمَانٍ يُوشِكُ أَنْ يَأْتِيَ يُغَرْبَلُ النَّاسُ فِيهِ غَرْبَلَةً وَتَبْقَى حُثَالَةٌ مِنَ النَّاسِ قَدْ مَرِجَتْ عُهُودُهُمْ وَأَمَانَاتُهُمْ فَاخْتَلَفُوا وَكَانُوا هَكَذَا ‏"‏ ‏.‏ وَشَبَّكَ بَيْنَ أَصَابِعِهِ قَالُوا كَيْفَ بِنَا يَا رَسُولَ اللَّهِ إِذَا كَانَ ذَلِكَ قَالَ ‏"‏ تَأْخُذُونَ بِمَا تَعْرِفُونَ وَتَدَعُونَ مَا تُنْكِرُونَ وَتُقْبِلُونَ عَلَى خَاصَّتِكُمْ وَتَذَرُونَ أَمْرَ عَوَامِّكُمْ ‏"‏ ‏.‏
Translation
Abu Musa narrated that the Messenger of Allah (ﷺ) said

“BeforetheHour comes there will be Harj.” I said: “O Messenger ofAllah, what isHarj?” He said: “Killing.” Some of the Muslimssaid: “O Messenger ofAllah, now we kill such and such a number ofidolaters in one year.”The Messenger of Allah (ﷺ) said: “Thatwill not be like killing theidolaters, rather you will kill oneanother, until a man will kill hisneighbor and son of the cousin anda relative.” Some of the peoplesaid: “O Messenger of Allah, willwe be in our right minds that day?”The Messenger of Allah (ﷺ)said: “No, reason will be taken away frommost of the people atthat time, and there will be left theinsignificant people who haveno reason.”