Jami` at-Tirmidhi 1947
جامع الترمذي#1947SahihAbu Hurairah narrated that Abul-Qasim, the Prophet of Repentance, said :"If somebody slanders his slave (by accusing him of committing illegal sexual intercourse) and the slave is innocent from what he says, Allah will impose the punishment upon him on the Day of Resurrection, unless it is as he said about him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 27:53