"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