It is narrated from Hazrat Abu Hurairah, may Allah be pleased with him, that he heard the Noble Prophet, peace and blessings be upon him, saying: "Knowledge will be taken away, tribulations will appear, and killing will become widespread." The companions, may Allah be pleased with them, asked, "O Prophet of Allah! What is meant by killing?" The Noble Prophet, peace and blessings be upon him, replied, "Killing, killing."