وَالَّذِي نَفْسِي بِيَدِهِ لَا تَذْهَبُ الدُّنْيَا حَتَّى يَأْتِيَ عَلَى النَّاسِ يَوْمٌ لَا يَدْرِي الْقَاتِلُ فِيمَ قَتَلَ، وَلَا الْمَقْتُولُ فِيمَ قُتِلَ، فَقِيلَ: كَيْفَ يَكُونُ ذَلِكَ؟ قَالَ: الْهَرْجُ، الْقَاتِلُ وَالْمَقْتُولُ فِي النَّارِ
Translation: By Him in whose hand is my soul, the world will not end before a time comes when the killer does not know why he killed and the slain does not know why he was killed. Asked how that would be, the Prophet ﷺ replied: “Harj” (widespread killing); “the killer and the slain are in the Fire.”
Source: مسلم
الْهَرْجُ here means widespread killing. الْقَاتِلُ is “the killer,” while الْمَقْتُولُ is “the one killed.” لَا يَدْرِي means “does not know,” and فِيمَ asks “for what reason?”
The report depicts severe disorder in which even the reasons for taking and losing life become obscure. It highlights the sanctity of human life and the gravity of violence.