Abu Dawud Book 24, Hadith Number 3932.
Chapter : The view that a slave will not be required to work for purchasing his freedom.
Narated By N/A : Ibn ‘Umar reported the Apostle of Allah (may peace be upon him) as say-ing: If anyone emancipates his share in a slave, he-should emancipate him completely if he has enough money to pay the full price; but if he has none, he will be emanci-pated to the extent of his share.