Jami` at-Tirmidhi 1542
جامع الترمذي#1542SahihNarrated Suwaid bin Muqarrin Al-Muzani:"We were seven brothers without a servant except one, and one of us slapped her, so the Prophet (ﷺ) ordered us to free her
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih Muslim
In-book reference: 20:21