Hadith #4172 (Sahih Muslim)
Book: The Book of Oaths
Narrator(s): Hilal bin Yasaf هلال بن يساف
Grade: Sahih

You could find no other part (to slap) but the prominent part of her face. See I was one of the seven sons of Muqarrin, and we had but only one slave-girl. The youngest of us slapped her, and Allah’s Messenger (ﷺ) commanded us to set her free. 2097

Source: https://parallelquran.com/hadith/sahih-muslim-4172/

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Hadith #4173 (Sahih Muslim)
Book: The Book of Oaths
Narrator(s): Hilal bin Yasaf هلال بن يساف
Grade: Sahih

We used to sell cloth in the house of Suwaid b. Muqarrin, the brother of Nu’man b. Muqarrin. There came out a slave-girl, and she said something to a person amongst us, and he slapped her. Suwaid was enraged-the rest of the hadlth is the same.

Source: https://parallelquran.com/hadith/sahih-muslim-4173/