Sahih al-Bukhari 1463
صحيح البخاري#1463SahihNarrated Abu Huraira:Allah's Messenger (ﷺ) said, "There is no Zakat either on a horse or a slave belonging to a Muslim
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 24:65