Muwatta Malik #630
Zakat
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرِ بْنِ عَمْرِو بْنِ حَزْمٍ، أَنَّهُ قَالَ جَاءَ كِتَابٌ مِنْ عُمَرَ بْنِ عَبْدِ الْعَزِيزِ إِلَى أَبِي وَهُوَ بِمِنًى أَنْ لاَ يَأْخُذَ مِنَ الْعَسَلِ وَلاَ مِنَ الْخَيْلِ صَدَقَةً .
Yahya related to me from Malik that Abdullah ibn Abi Bakr ibn Amr
ibn Hazim said, "A message came from Umar ibn Abd al-Aziz to my father
when he was in Mina telling him not to take zakat from either honey or
horses."
About Muwatta Malik
This hadith is #630 from Muwatta Malik, in the Book of Zakat.