Husayn bin Abd al-Rahman al-Sulami (may Allah have mercy on him) said: I heard Hilal bin Yasaf (may Allah have mercy on him) say: We used to deal in cloth in the house of Sayyiduna Suwayd bin Muqarrin (may Allah be pleased with him). A slave-girl came and said something to a man, and he slapped her on the face. Sayyiduna Suwayd bin Muqarrin (may Allah be pleased with him) said: "Did you slap this face? We were seven brothers with only one slave; one brother slapped her, and he (peace and blessings be upon him) ordered the seven: 'Set her free.'"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النفقات / 15805