Musnad Abu Ya'la al-Mawsili 53:2

Abu Bakr ibn Abi Shaybah narrated to us, Waki' narrated to us, from Shu'bah, from Ma'bad ibn Khalid, who said: I heard Harithah ibn Wahb al-Khuza'i say: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Give charity, for it is near that a man will go out with his charity and will not find anyone to accept it."