I heard the Messenger of Allah ﷺ say, "Knowledge will be taken away, tribulations will appear, and harj will increase."Someone asked, "Messenger of Allah, what is harj?"He gestured with his hand like this, meaning killing.
حدثنا محمد بن بكر أخبرنا حنظلة قال سمعت سالما يقول سمعت
سمعت رسول الله ﷺ يقول يقبض العلم وتظهر الفتن ويكثر الهرج قيل يا رسول الله وما الهرج قال بيده هكذا يعني القتل
Its chain of transmission is sahih. It has previously occurred at 10672. Hanzala is Ibn Abu Sufyan bin Abdul-Rahman bin Safwan bin Umaya, a well-known trustworthy narrator, and Salim is Ibn Abdullah bin Umar bin Khattab.