(93) بَابُ مَنْ لَطَمَ عَبْدَهُ فَلْيُعْتِقْهُ مِنْ غَيْرِ إِيجَابٍ
Hilal ibn Yasaf said, "We used to sell linen in the house of Suwaydibn Muqarrin. A slavegirl came out and said something to one of the menand that man slapped her. Suwayd ibn Muqarrin asked him, 'Did you slapher face? We were seven and we only had a single servant. Then one of usslapped her and the Prophet, may Allah bless him and grant him peace, orderedhim to set her free.'"
Reference: Al-Adab Al-Mufrad 176
In-book reference: Book 9, Hadith 21
English translation: Book 9, Hadith 176