Sahih Muslim , Book 9, Hadith 3603 (USC-MSA) ⓘ
Abu Huraira (Allah be pleased with him) reported Allah's Messenger (may peace benpon 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.
وَحَدَّثَنَا دَاوُدُ بْنُ رُشَيْدٍ، حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، عَنْ مُحَمَّدِ بْنِ مُطَرِّفٍ أَبِي غَسَّانَ، الْمَدَنِيِّ عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ عَلِيِّ بْنِ حُسَيْنٍ، عَنْ سَعِيدِ ابْنِ مَرْجَانَةَ، عَنْ أَبِي هُرَيْرَةَ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ " مَنْ أَعْتَقَ رَقَبَةً أَعْتَقَ اللَّهُ بِكُلِّ عُضْوٍ مِنْهَا عُضْوًا مِنْ أَعْضَائِهِ مِنَ النَّارِ حَتَّى فَرْجَهُ بِفَرْجِهِ " .
also referenced under: Book 20, Hadith 26 (In-Book) & Hadith 1509 (Reference)