Sahih Muslim | Book 9 | Hadith Number 3604

Narrated by Abu Huraira (Allah be pleased with him)
Abu Huraira (Allah be pleased with him) reported: I heard Allah's Messenger (may peace be upon him) as saying: He who emancipates a believing slave. Allah will set free from Fire his every limb for every limb of his (slave's), even his private parts for his.