"I heard the Messenger of Allah ﷺ saying: 'Whoever frees a believing slave, then Allah frees a limb from the Fire for each of his limbs, such that he frees his private parts in lieu of his private parts.'"  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ مَنْ أَعْتَقَ رَقَبَةً مُؤْمِنَةً أَعْتَقَ اللَّهُ مِنْهُ بِكُلِّ عُضْوٍ مِنْهُ عُضْوًا مِنَ النَّارِ حَتَّى يُعْتِقَ فَرْجَهُ بِفَرْجِهِ قَالَ وَفِي الْبَابِ عَنْ عَائِشَةَ وَعَمْرِو بْنِ عَبَسَةَ وَابْنِ عَبَّاسٍ وَوَاثِلَةَ بْنِ الأَسْقَعِ وَأَبِي أُمَامَةَ وَعُقْبَةَ بْنِ عَامِرٍ وَكَعْبِ بْنِ مُرَّةَ