A man amongst us declared that his slave would be freed after his death. The Prophet (ﷺ) called for that slave and sold him. The slave died the same year.
Sahih al-Bukhari Book 49, Hadith 18
← Previous Hadith `Utba bin Abi Waqqas authorized his brother Sa`d bin Abi Waqqas to take the son of the slave-girl of Zam`a into his custody, telling him that the boy was his own (illegal) son. When Allah's Messenger (ﷺ) went (to Mecca) at the time of the Conquest, Sa`d took the son of the slave-girl of Zam`a to Allah's Messenger (ﷺ) and also brought 'Abu bin Zam`a with him and said, "O Allah's Messenger (ﷺ)! This is the son of my brother `Utba who authorized me to take him into my custody." 'Abu bin Zam`a said, "O Allah's Messenger (ﷺ)! He is my brother, the son of Zam`a's slave-girl and he was born on his bed." Allah's Messenger (ﷺ) looked at the son of the slave-girl of Zam`a and noticed much resemblance (to `Utba). Allah's Messenger (ﷺ) said, "It is for you, O 'Abu bin Zam`a as he was born on the bed of your father." Allah's Messenger (ﷺ) then told Sauda bint Zam`a to observe veil in the presence of the boy as he noticed the boy's resemblance to `Utba and Sauda was the wife of the Prophet (ﷺ) .

Sahih al-Bukhari Book 49, Hadith 17 Next Hadith → Allah's Messenger (ﷺ) forbade the selling or donating the Wala' of a freed slave.

Sahih al-Bukhari Book 49, Hadith 19