It is narrated from Sayyiduna Yazid Abu Abd al-Rahman (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said during the Farewell Hajj: "Take care of your slaves, take care of your slaves! Feed them from what you yourselves eat and clothe them from what you yourselves wear. And if they commit a fault that you do not wish to forgive, then sell the servants of Allah, and do not torment them."
Hadith Referenceالمعجم الكبير للطبراني / باب الياء / 18856