Sahih Bukhari
Partnership
Volume: 003 / Book Number: 044 / Hadith Number: 681
Narrated Ibn 'Umar:
The Prophet said, "Whoever manumits his share o a jointly possessed slave, it is imperative on him to manumit the slave completely if he has sufficient money to pay the rest of its price which is to be estimated justly. He should pay his partners their shares and release him (the freed one).