Abu Masud Uqba bin Amr reported,

I was beating a slave of mine when I heard a voice behind me that I could not make out, saying, "Abu Masud, Allah has more power over you than you have over him."I turned around and saw that it was the Messenger of Allah ﷺ.I said, "Messenger of Allah, he is free for the sake of Allah."The Messenger of Allah ﷺ said, "Had you not done so, the Fire would have scorched you," or, "the Fire would have touched you."

عن أبي مسعود الأنصاري قال

كنت أضرب غلاما لي، فسمعت من خلفي صوتا لا أعلمه: أبا مسعود! الله أقدر عليك منك عليه. فالتفت فإذا هو رسول الله ﷺ. فقلت: يا رسول الله، هو حر لوجه الله. فقال رسول الله ﷺ: أما لو لم تفعل للفحتك النار، أو لمستك النار.