Chapter 28: The Book of Oaths
Abu Mas' ud al-Ansari reported: 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 Allah' s Messenger (ﷺ). I said: Allah' s Messenger, 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.
Sahih Muslim 1659c