Sahih Muslim Book 015, Hadith Number 4094.
Chapter : Feeding of slave with what the master cats himself and clothing him with what he wears himself and not to burden him beyond capacity.
Ma'rur b. Suwaid reported: I saw Abu Dharr wearing clothes, and his slave wearing similar ones. I asked him about it, and he narrated that he had abused a person during the lifetime of Allah's Messenger (may peace be upon him) and he reproached him for his mother. That person came to Allah's Apostle (may peace be upon him) and made mention of that to him. Thereupon Allah's Apostle (may peace be upon him) said: You are a person who has (remnants of) Ignorance in him. Your slaves are brothers of yours. Allah has placed them in your hand, and he who has his brother under him, he should feed him with what he eats, and dress him with what he dresses himself, and do not burden them beyond their capacities, and if you burden them,(beyond their capacities), then help them.