It is narrated from Hazrat Abu Hurairah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Whoever frees a Muslim slave, Allah will free every limb of the one who frees him from Hell in exchange for every limb of the slave—even a hand for a hand, a foot for a foot, and a private part for a private part. Upon hearing this hadith, Ali bin Husain (may Allah have mercy on him) called his slave and set him free.