Wages (Kitab Al-Ijarah)
Dawud :: Book 23 : Hadith 3503
Narrated Aisha, Ummul Mu'minin:
A man bought a slave, and he remained with him as long as Allah wished him to remain. He then found defect in him. He brought his dispute with him to the Prophet (peace_be_upon_him) and he returned him to him. The man said: Apostle of Allah, my slave earned some wages. The Apostle of Allah (peace_be_upon_him) then said: Profit follows responsibility.