Abu Huraira (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings of Allah be upon him) said: Whoever frees a believing slave, Allah Almighty will free every limb of his in exchange for every limb of that slave from Hell, even to the extent that a hand for a hand, a leg for a leg, and a private part for a private part will be freed. Ali bin Husain (may Allah have mercy on him) asked: Saeed! Did you yourself hear this hadith from Abu Huraira (may Allah be pleased with him)? He replied: Yes! Then Ali bin Husain (may Allah have mercy on him) said to the chief of his slaves: Call Mutarrif to me. When he came before him, he said: Go, you are free for the sake of Allah.

Sayyiduna Abu Dharr (may Allah be pleased with him) narrates that he asked: O Messenger of Allah! Which deed is the best? He replied: To have faith in Allah and to strive in His path. He asked: Which slave is best to set free? He replied: The one who is most valuable and most beloved to his owners. He says: I asked: If I am not able to do that (set such a slave free)? He replied: Help someone who is in need or do work for someone who is unskilled. He said: If I am unable to do even that (i.e., cannot do this either)? He replied: Refrain from evil; this is a charity that you do for your own self.

Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that the Prophet Muhammad (peace and blessings be upon him) said: If a slave is owned by several partners, and one of them frees his share, then if he has wealth equal to the (remaining) value of the slave, it is his responsibility to free the remaining share as well. Otherwise (if he does not have wealth), then only the portion that has been freed on his behalf will be considered freed.

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: A son can only fulfill the right of his father if he finds him as a slave, then buys him and sets him free.

Sayyiduna Abdullah bin Umar (may Allah be pleased with them) narrates that the Messenger of Allah (peace and blessings be upon him) said: Whoever becomes the owner of a mahram relative (those with whom marriage is forbidden if one of them is a woman), then that slave is free.

Sayyiduna Samurah bin Jundub (may Allah be pleased with him) reports that the Noble Prophet (peace and blessings be upon him) said: Whoever becomes the owner of a mahram relative (one with whom marriage is forbidden), then that slave is free.

Abu Huraira (may Allah be pleased with him) narrates that after hearing three things from the Messenger of Allah (peace and blessings be upon him), I will continue to love Banu Tamim. (1) I heard the Prophet (peace and blessings be upon him) saying: Among my Ummah, they (Banu Tamim) will be the most severe against the Dajjal. (2) When their charity came, the Prophet (peace and blessings be upon him) said: These are the charities of our people. (3) There was a slave girl from among them (Banu Tamim) with Lady Aisha (may Allah be pleased with her), and the Messenger of Allah (peace and blessings be upon him) said: Set her free, for she is from the descendants of Ismail (peace be upon him).

This narration is also reported through another chain.

Sayyiduna Abu Abdur Rahman Safinah (may Allah be pleased with him) narrates that Sayyidah Umm Salamah (may Allah be pleased with her) set me free and placed this condition upon me that I would serve the Prophet (peace and blessings of Allah be upon him) for my entire life.

Lady Aisha (may Allah be pleased with her) narrates that the owners of Lady Barirah (may Allah be pleased with her) set the condition of wala (right of inheritance). They asked the Prophet Muhammad (peace and blessings be upon him) about freeing Barirah (may Allah be pleased with her), so the Prophet Muhammad (peace and blessings be upon him) said: The right of wala belongs only to the one who sets free.