The Prophet ﷺ said, "If somebody manumits a Muslim slave, Allah will save from the Fire every part of his body for freeing the corresponding parts of the slave's body, even his private parts will be saved from the Fire) because of freeing the slave's private parts."  

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ أَعْتَقَ رَقَبَةً مُسْلِمَةً أَعْتَقَ اللَّهُ بِكُلِّ عُضْوٍ مِنْهُ عُضْوًا مِنَ النَّارِ حَتَّى فَرْجَهُ بِفَرْجِهِ  

“I said: 'O Messenger of Allah ﷺ, which slave is best?' He said: ‘The one who is most precious to his master and most valuable in price.' ”  

قُلْتُ يَا رَسُولَ اللَّهِ أَىُّ الرِّقَابِ أَفْضَلُ قَالَ أَنْفَسُهَا عِنْدَ أَهْلِهَا وَأَغْلاَهَا ثَمَنًا  

I said: Messenger of Allah, which of the deeds is the best? He (the Holy Prophet) replied: Belief in Allah and Jihad in His cause. I again asked: Who is the slave whose emancipation is the best? He (the Holy Prophet) replied: One who is valuable for his master and whose price is high. I said: If I can't afford to do it? He (the Holy Prophet) replied: Help an artisan or make anything for the unskilled (labourer). I (Abu Dharr) said: Messenger of Allah, you see that I am helpless in doing some of these deeds. He (the Holy Prophet) replied: Desist from doing mischief to the people. That is the charity of your person on your behalf.  

قُلْتُ يَا رَسُولَ اللَّهِ أَىُّ الأَعْمَالِ أَفْضَلُ قَالَ الإِيمَانُ بِاللَّهِ وَالْجِهَادُ فِي سَبِيلِهِ قَالَ قُلْتُ أَىُّ الرِّقَابِ أَفْضَلُ قَالَ أَنْفَسُهَا عِنْدَ أَهْلِهَا وَأَكْثَرُهَا ثَمَنًا قَالَ قُلْتُ فَإِنْ لَمْ أَفْعَلْ قَالَ تُعِينُ صَانِعًا أَوْ تَصْنَعُ لأَخْرَقَ قَالَ قُلْتُ يَا رَسُولَ اللَّهِ أَرَأَيْتَ إِنْ ضَعُفْتُ عَنْ بَعْضِ الْعَمَلِ قَالَ تَكُفُّ شَرَّكَ عَنِ النَّاسِ فَإِنَّهَا صَدَقَةٌ مِنْكَ عَلَى نَفْسِكَ