when a slave acts sincerely towards his master and worship Allah well, he will have a double reward.
Sunan Abi Dawud Book 43, Hadith 397
← Previous Hadith I came to Ibn ‘Umar when he set his slave free. He took a stick or something else from the earth and said; for me there is no reward even equivalent to this. I heard the Messenger of Allah (May peace be upon him) say: If anyone slaps or beats his slave the atonement due from him is to set him free.

Sunan Abi Dawud Book 43, Hadith 396 Next Hadith → The Prophet (ﷺ) said: If anyone corrupts (instigates) the wife of a man or his slave (against him), he is not from us.

Sunan Abi Dawud Book 43, Hadith 398