Abu Dawud Book 24, Hadith Number 3936.

Chapter : The view that a slave will not be required to work for purchasing his freedom.

Narated By N/A : Ibn ‘Umar reported the Prophet (may peace be upon him) as saying: If a man is shared by two men, and one of them emancipates his share, a price of the slave will be fixed, not more or less, and he will be emancipated by him in case he is rich.