Sahih al-Bukhari Book 49, Hadith 7
Allah's Messenger (ﷺ) said, "Whoever manumits his share of a slave, then it is essential for him to get that
slave manumitted' completely as long as he has the money to do so. If he has not sufficient money to
pay the price of the other shares (after the price of the slave is evaluated justly), the manumitted
manumits the slave partially in proportion to his share.
`Ubaidullah narrated as above in brief.
Allah's Messenger (ﷺ) said, "Whoever frees his share of a common slave and he has sufficient money to free him completely, should let its price be estimated by a just man and give his partners the price of their shares and manumit the slave; otherwise (i.e. if he has not sufficient money) he manumits the slave partially."
The Prophet (ﷺ) said, "He who manumits his share of a slave and has money sufficient to free the remaining portion of that slave's price (justly estimated) then he should manumit him (by giving the rest of his price to the other co-owners)." Nafi` added, "Otherwise the slave is partially free." Aiyub is not sure whether the last statement was said by Nafi` or it was a part of the Hadith.