Musnad Ahmad 30:3731

Ali narrated to us, Warqa’ informed us, from Abu al-Zinad, from al-A’raj, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The Hour will not be established until wealth becomes abundant among you, to the point that a man will be concerned about who will accept his wealth from him. And until he offers it as charity, and the one to whom he offers it says: 'I have no need for it.'"