The Book of Manumission of Slaves
كتاب العتق
Chapter 14: Which Slave Is Better?
Along with the Messenger of Allah (ﷺ) we besieged the palace of at-Ta'if. The narrator, Mutadh, said: I heard my father (sometimes) say: "Palace of at-Ta'if," and (sometimes) "Fort of at-Ta'if," which are the same.
I heard the Messenger of Allah (ﷺ) say: he who causes an arrow to hit its mark in Allah's cause will have it counted as a degree for him (in Paradise). He then transmitted the rest of the tradition.
I heard the Messenger of Allah (ﷺ) say: If a Muslim man emancipates a Muslim man, Allah, the Exalted, will make every bone of his protection for every bone of his emancipator from Hell; and if a Muslim woman emancipates a Muslim woman, Allah will make every bone of hers protection for every bone of her emancipator from Hell on the Day of Resurrection.
I heard the Messenger of Allah (ﷺ) say: If anyone emancipates a Muslim slave, that will be his ransom from Jahannam.
Abu Dawud said: Salim did not hear (traditions) from Shurahbil. Shurahbil died at Siffin.
Chapter 15: The Virtue Of Manumitting Slaves When The Master Is Healthy
The Prophet (ﷺ) said: the similitude of a man who emancipates a slave at the time of his death is like that of a man who gives a present after satisfying his appetite.