Hilal bin Yasaf says that we were selling cloth in the house of Suwaid bin Muqarrin. A slave girl came out and said something to a man. That man slapped the slave girl, so Suwaid bin Muqarrin said to him: Did you slap her on the face? I found myself to be one of seven persons (i.e., we were seven men) and we had only one servant. One of us slapped her, so the Prophet ( صلی اللہ علیہ وسلم ) ordered that she be set free.

I slapped a poor servant of ours, so my father called me and said (to him): Retaliate. We, the sons of Muqrin, were seven, and we had a servant. One of us slapped her, and that was mentioned to the Prophet صلی اللہ علیہ وسلم , so he said: "Order them to set her free." It was said to the Prophet صلی اللہ علیہ وسلم : They have no other servant besides her. He said: Then let them make use of her, and when they no longer need her, let her go free. / 178.

132c/176 And in another narration from Abu Shu'bah from Suwayd ibn Muqarrin al-Muzani—he saw a man slap his servant—he said: "Do you not know that striking the face is forbidden? I saw myself, and I was the seventh of seven brothers, in the time of the Messenger of Allah صلی اللہ علیہ وسلم , and we had nothing but one servant. One of us slapped him, so the Prophet صلی اللہ علیہ وسلم ordered us to set him free." / 179.