Yahya related to me from Malik that Abdullah ibn Abi Bakr ibn Amribn Hazim said, "A message came from Umar ibn Abd al-Aziz to my fatherwhen he was in Mina telling him not to take zakat from either honey orhorses."
USC-MSA web (English) reference: Book 17, Hadith 40
Arabic reference: Book 17, Hadith 616