Yahya bin Hakeem al-Maquuam يحيى بن حكيم المقوم · The Chapters on Manumission (of Slaves)

“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.”