Sunan an-Nasa'i 2471
سنن النسائي#2471SahihIt was narrated from Abu Hurairah that the Prophet said:"The Muslim does not have to pay Sadaqah on his slave or his horse
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiHasan
In-book reference: 23:37