Abu Dawud Book 3, Hadith Number 1625.
Narated By Sahl ibn Hanzaliyyah : Uyaynah ibn Hisn and Aqra’ ibn Habis came to the Apostle of Allah (PBUH). They begged from him. He commanded to give them what they begged. He ordered Mu’awiyah to write a document to give what they begged. Aqra’ took his document, wrapped it in his turban, and went away.
As for Uyaynah, he took his document and came to the Prophet (PBUH) at his home, and said to him: Muhammad, do you see me? I am taking a document to my people, but I do not know what it contains, just like the document of al-Mutalammis. Mu’awiyah informed the Apostle of Allah (PBUH) of his statement.
Thereupon the Apostle of Allah (PBUH) said: He who begs (from people) when he has sufficient is simply asking for a large amount of Hell-fire. (An-Nufayl (a transmitter) said elsewhere: “embers of Hell”.)
They asked: Apostle of Allah, what is a sufficiency? (Elsewhere an-Nufayl said: What is a sufficiency which makes begging unfitting?)
He replied: It is that which would provide a morning and an evening meal. (Elsewhere an-Nufayl said: It is when one has enough for a day and night, or for a night and a day.) He (an-Nufayl) narrated to us this tradition briefly in the words that I have mentioned.