Hadith 4315
Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates: I heard the Prophet Muhammad (peace and blessings be upon him) say: "Any slave who is jointly owned by people, and one of them frees his share, then a fair price for the slave will be set from the wealth of the one who freed his share, and then the slave will be completely freed if the one who freed (his share) possesses enough wealth (equal to the price of the slave)."