Zakat (Kitab Al-Zakat)
Dawud :: Book 9 : Hadith 1581
Narrated Bashir ibn al-Khasasiyyah:
(Ibn Ubayd said in the version of his tradition that his name was not Bashir, but (it was) the Apostle of Allah (peace_be_upon_him) (who had) named him Bashir)
We said: (to the Apostle of Allah): The collectors of sadaqah collect more than is due; can we hide our property to that proportion? He replied: "No."