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.
عَنْ رَسُولِ اللَّهِ ﷺ قَالَ مَنْ أَعْتَقَ رَقَبَةً أَعْتَقَ اللَّهُ بِكُلِّ عُضْوٍ مِنْهَا عُضْوًا مِنْ أَعْضَائِهِ مِنَ النَّارِ حَتَّى فَرْجَهُ بِفَرْجِهِ