Yahya related to me from Malik from Urwa ibn Husayn from A'ishabint Qudama that her father said, "When I used to come to Uthman ibnAffan to collect my allowance he would ask me, 'Do you have anyproperty on which zakat is due? 'If I said, 'Yes,' he would deductthe zakat on that property from my allowance, and if I said, 'No,' hewould pay me my allowance (in full)."
USC-MSA web (English) reference: Book 17, Hadith 5
Arabic reference: Book 17, Hadith 585