Sunan Ibn Majah Book 19, Hadith 17
“Whoever frees his share of a slave, the price of the slave should be fairly evaluated, and he (the partner who initiated this process) should free him (in full, by giving the rest of his price to the other co-owners), if he has enough wealth to do so. Otherwise, he will have freed whatever he freed.”
“Whoever frees his share of a slave or part of his share, must pay from his wealth if he has any wealth if he has any wealth (in order to buy the rest of the slave's freedom). If he does not have wealth, then the slave should be asked to work for the price (of his freedom), without that causing him too much hardship.”
“Whoever frees a slave who has some wealth, the slave's wealth belongs to him, unless the master stipulates that it will belong to him.”