"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."  

أَبُو الْقَاسِمِ ﷺ نَبِيُّ التَّوْبَةِ مَنْ قَذَفَ مَمْلُوكَهُ بَرِيئًا مِمَّا قَالَ لَهُ أَقَامَ عَلَيْهِ الْحَدَّ يَوْمَ الْقِيَامَةِ إِلاَّ أَنْ يَكُونَ كَمَا قَالَ  

"I was beating a slave of mine and I heard someone behind me saying: 'Beware O Abu Mas'ud! Beware O Abu Mas'ud!' So I turned around and saw that it was the Messenger of Allah. He said: 'Allah has more power over you than you do over him." Abu Mas'ud said: "I have not beaten any slave of mine since then."  

فَسَمِعْتُ قَائِلاً مِنْ خَلْفِي يَقُولُ اعْلَمْ أَبَا مَسْعُودٍ اعْلَمْ أَبَا مَسْعُودٍ فَالْتَفَتُّ فَإِذَا أَنَا بِرَسُولِ اللَّهِ ﷺ فَقَالَ لَلَّهُ أَقْدَرُ عَلَيْكَ مِنْكَ عَلَيْهِ قَالَ أَبُو مَسْعُودٍ فَمَا ضَرَبْتُ مَمْلُوكًا لِي بَعْدَ ذَلِكَ