When I was beating my servant, I heard a voice behind me (saying): Abu Mas'ud, bear in mind Allah has more dominance over you than you have upon him. I turned and (found him) to be Messenger of Allah ﷺ. I said: Messenger of Allah, I set him free for the sake of Allah. Thereupon he said: Had you not done that, (the gates of) Hell would have opened for you, or the fire would have burnt you.
فَسَمِعْتُ مِنْ خَلْفِي صَوْتًا اعْلَمْ أَبَا مَسْعُودٍ لَلَّهُ أَقْدَرُ عَلَيْكَ مِنْكَ عَلَيْهِ فَالْتَفَتُّ فَإِذَا هُوَ رَسُولُ اللَّهِ ﷺ فَقُلْتُ يَا رَسُولَ اللَّهِ هُوَ حُرٌّ لِوَجْهِ اللَّهِ فَقَالَ أَمَا لَوْ لَمْ تَفْعَلْ لَلَفَحَتْكَ النَّارُ أَوْ لَمَسَّتْكَ النَّارُ