Musnad Ahmad 30:2769

Muhammad ibn Ja‘far narrated to us, he said: Shu‘bah narrated to us, he said: I heard al-‘Ala’ ibn ‘Abd al-Rahman narrating from his father, from Abu Hurayrah, from the Prophet, may God bless him and grant him peace, that he said: "The Hour will not be established until thirty impostors (dajjals) appear, all of them claiming that he is the Messenger of God, wealth overflows and becomes abundant, tribulations appear, and al-harj increases." It was said: "What is al-harj?" He said: "Killing, killing," three times.