Narrated Abu Huraira: I heard Abu-l-Qasim (the Prophet) saying, "If somebody slanders his slave and the slave is free from what he says, he will be flogged on the Day of Resurrection unless the slave is really as he has described him."
Hadith ReferenceSahih Bukhari / The Book of Al-Maharbeen / Hadith: 6858
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة