Musnad Ahmad 30:422

'Abd al-A'la narrated to us, from Ma'mar, from Muhammad ibn Ziyad, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, with the like of this hadith, except that he said: They said: "O Messenger of Allah, then who is the needy person (al-miskin)?" He said: "The one who does not have sufficiency, and does not ask people importunately."