From Sahih Bukhari (Hadith 7061):
Narrated Abu Huraira:The Prophet (ﷺ) said, "Time will pass rapidly, good deeds will decrease, miserliness will be thrown (in the hearts of the people) afflictions will appear and there will be much 'Al-Harj." They said, "O Allah's Apostle! What is "Al-Harj?" He said, "Killing! Killing!" (See Hadith No. 63, Vol)
Reference: Bukhari 7061