Mishkat al-Masabih #3248
Emancipation
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
عَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ أَعْتَقَ رَقَبَةً مُسْلِمَةً أَعْتَقَ اللَّهُ بِكُلِّ عُضْوٍ مِنْهُ عُضْوًا مِنَ النَّارِ حَتَّى فَرْجَهُ بِفَرْجِهِ»
Abu Huraira reported God's Messenger as saying, "If anyone emancipates a Muslim slave, God will set free from hell a member of the body for every member of his, even his private parts for his."
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #3248 from Mishkat al-Masabih, in the Book of Emancipation.