Hilal bin Yasaf reported,

We were staying at the house of Suwayd bin Muqarin, and among us was an old man with a sharp temper who had a slave girl with him. He struck her on the face, and I have never seen Suwayd more angry than he was that day.Suwayd said, "Could you find nothing to strike but the noblest part of her, her face? Let me tell you, I was the seventh of seven sons of Muqarin, and we had only a single servant. The youngest of us slapped her face, and the Prophet ﷺ ordered us to set her free."

Abu Dawud 5166

Sahih

حدثنا مسدد حدثنا فضيل بن عياض عن حصين

عن هلال بن يساف قال

كنا نزولا في دار سويد بن مقرن وفينا شيخ فيه حدة ومعه جارية له فلطم وجهها فما رأيت سويدا أشد غضبا منه ذاك اليوم قال عجز عليك إلا حر وجهها لقد رأيتنا سابع سبعة من ولد مقرن وما لنا إلا خادم فلطم أصغرنا وجهها فأمرنا النبي ﷺ بعتقها

أبو داود 5166صحيح
Contents
Reference
Commentary
Ayat
Collection
Sunan Abu Dawud
Book
Manners
Chapter
Right of the slave
Numbering
Darussalam 5166
Abu Dawud 5166