Hadith 5:585
Abu Bakr narrated to us, he said: Hafs narrated to us, from al-Dahhak ibn Uthman, from Nafi’, from Ibn Umar: He said: He had two mukatabs (slaves under a contract of manumission), and he did not pay (zakat) on their behalf.
حدثنا أبو بكر قال حدثنا حفص عن الضحاك بن عثمان عن نافع عن بن عمر قال كان له مكاتبان فلم يعط عنهما