Yahya related to me from Malik from Abdullah ibn Umar from Sulayman ibn Yasar from Irak ibn Malik from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "A muslim does not have to pay any zakat on his slave or his horse."
Muwatta Malik Book 17, Hadith 41
← Previous Hadith Malik said, "The sunna that we are all agreed upon here (in Madina) and which I have heard from the people of knowledge, is that there is no zakat on any kind of fresh (soft) fruit, whether it be pomegranates, peaches, figs or anything that is like them or not like them as long as it is fruit."

He continued, "No zakat has to be paid on animal fodder or herbs and vegetables of any kind, and there is no zakat to pay on the price realised on their sale until a year has elapsed over it from the day of sale which counts as the time the owner receives the sum."

Muwatta Malik Book 17, Hadith 40 Next Hadith → Yahya related to me from Malik from Ibn Shihab from Sulayman ibn Yasar that the people of Syria said to Abu Ubayda ibn al-Jarrah, "Take zakat from our horses and slaves," and he refused. Then he wrote to Umar ibn al-Khattab and he (also) refused. Again they talked to him and again he wrote to Umar, and Umar wrote back to him saying, "If they want, take it from them and (then) give it back to them and give their slaves provision."

Malik said, "What he means, may Allah have mercy upon him, by the words 'and give it back to them' is, 'to their poor.' "

Muwatta Malik Book 17, Hadith 42