Sahih Muslim
Sahih Muslim Book 009, Hadith Number 3603.
Hadith Section/Book: Sahih Muslim Sahih Muslim Book 09. Divorce
Chapter: Excellence of emancipating a slave.
Abu Huraira (Allah be pleased with him) reported Allah's Messenger (may peace be upon him) as saying: He who emancipates a slave, Allah will set free from Hell every limb (of his body) for every limb of his (slave's) body, even his private parts.