Kitab al-Fitan · Nu'aym ibn Hammad

Narrated `Abdullah and Abu Musa: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

Abu Musa narrated that the Messenger of Allah (ﷺ) said:“Before the Hour comes there will be Harj.” I said: “O Messenger of Allah, what is Harj?” He said: “Killing.” Some of the Muslims said: “O Messenger of Allah, now we kill such and such a number of idolaters in one year.” The Messenger of Allah (ﷺ) said: “That will not be like killing the idolaters, rather you will kill one another, until a man will kill his neighbor and son of the cousin and a relative.” Some of the people said: “O Messenger of Allah, will we be in our right minds that day?” The Messenger of Allah (ﷺ) said: “No, reason will be taken away from most of the people at that time, and there will be left the insignificant people who have no reason.”