Ma’rur b. Suwaid said :I saw Abu Dharr at Rabadhah. He was wearing a thick cloak, and his slave also wore a similar one. He said : the people said: Abu Dharr! (it would be better) if you could take the cloak which your slave wore, and you combined that with, and it would be a pair of garments (hullah) and you would clothe him with another garment. He said: Abu Dharr said : I abused a man whose mother was a non-Arab and I reviled him for his mother. He complained against me to the apostle of allah (May peace be upon him). He said: Abu Dharr! You are a man who has a characteristic of pre-Islamic days. He said: they are your brethren; Allah has given you superiority over them; sell those who do not please you and do not punish Allah’s creatures

English translation · Sunan Abu Dawud