Musnad Ahmad 30:1016

The Messenger of Allah said: "The Hour will not be established until wealth becomes abundant among you and overflows, to the point that the owner of wealth will be concerned about who will accept his charity from him." He said: "And knowledge will be taken away, time will draw near, tribulations will appear, and *al-harj* will increase." They said: "What is *al-harj*, O Messenger of Allah?" He said: "Killing, killing."