Abu Hurairah (May Allah be pleased with him) said:
I heard the Messenger of Allah ﷺ saying, "He who accuses his slave of Zina will receive the punishment (Hadd) of slander on the Day of Resurrection, unless the accusation of Zina was true."

[Al-Bukhari and Muslim].

وعنه قال: سمعت رسول الله ﷺ يقول: "من قذف مملوكه بالزنا يقام عليه الحد يوم القيامة، إلا أن يكون كما قال" ((متفق عليه)).