´Abu Musa narrated that the Messenger of Allah(s.a.w) said:` "Indeed after you there will be days in which knowledge shall be raised up and Al-Harj shall abound." They said: "O Messenger of Allah(s.a.w)! What is Al-Harj?" He said: "Killing."
Hadith Referenceسنن ترمذي / كتاب الفتن عن رسول الله صلى الله عليه وسلم / 2200