question #1 Sahih al-Bukhari 2523, Book 49, Hadith 7 : What is the significance of manumitting a slave in Islam?

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.