when I was beating a servant of mine, I heard a voice behind me saying: know, Abu Mas’ud-Ibn al-Muthanna said: “twice”-that Allah has more power over you than you have over him. I turned round and saw that it was that it was the prophet (May peace be upon him). I said : Messenger of Allah! He is free for Allah’s sake. He said : If you had not done it, fire would have burned you or the fire would have touched you.
Sunan Abi Dawud Book 43, Hadith 387
← Previous Hadith We called on Abu Dharr at al-Rabadhah. He wore a cloak and his slave also wore a similar one. We said; Abu Dharr! If you took the cloak of your slave and combined it with your cloak, so that it could be a part of garments (hullah) and clothed him in another garment, (it would be better). He said; I heard the Messenger of Allah (May peace be upon him) say; They are your brethren. Allah has put them under your authority; so he who has his brother under his authority must feed him from what he eats and clothe him with what he wears, and not impose on him work which is too much for him, but if he does so, he must help him.

Abu Dawud said: Ibn Numair transmitted it from al-A'mash in a similar way.

Sunan Abi Dawud Book 43, Hadith 386 Next Hadith → The tradition mentioned above has also been transmitted by al-A’mash in a similar way to same way to the same effect through a different chain of narrators.

Sunan Abi Dawud Book 43, Hadith 388