Sahih al-Bukhari Book 47, Hadith 9
Ibn `Umar said, "Allah's Messenger (ﷺ) said, 'If one manumits his share of a jointly possessed slave, and can
afford the price of the other shares according to the adequate price of the slave, the slave will be
completely manumitted; otherwise he will be partially manumitted.' " (Aiyub, a sub-narrator is not
sure whether the saying " ... otherwise he will be partially manumitted" was said by Nafi` or the
Prophet.)
"While at Medina we were struck with famine. Ibn Az-Zubair used to provide us with dates as our food. Ibn `Umar used to pass by us and say, "Don't eat two dates together at a time as the Prophet (ﷺ) has forbidden eating two dates together at a time (in a gathering) unless one takes the permission of one's companion brother."
The Prophet (ﷺ) said, "Whoever manumits his share of a jointly possessed slave, it is imperative for him to get that slave manumitted completely by paying the remaining price, and if he does not have sufficient money to manumit him, then the price of the slave should be estimated justly, and he is to be allowed to work and earn the amount that will manumit him (without overburdening him)".