The Messenger of Allah ﷺ said, "There is no zakat due from a Muslim on his slave or his horse."
حدثنا أبو بكر بن أبي شيبة حدثنا سفيان بن عيينة عن عبد الله بن دينار عن سليمان بن يسار عن عراك بن مالك
قال رسول الله ﷺ ليس على المسلم في عبده ولا في فرسه صدقة
Bukhari narrated it in Zakat, Chapter "There is no zakat on a Muslim for his horse," Hadith 1463, 1464, and Muslim in Zakat, Chapter "There is no zakat on a Muslim for his slave and his horse," Hadith 982, from the hadith of Ibn Dinar, through this same chain.