Mishkat al-Masabih #266
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
عَنْ عُثْمَانَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ تَوَضَّأَ فَأَحْسَنَ الْوُضُوءَ خَرَجَتْ خَطَايَاهُ مِنْ جَسَدِهِ حَتَّى تخرج من تَحت أَظْفَاره»
‘Uthman reported God’s messenger as saying, “If anyone performs the ablution well, his sins will come out from his body, even coming out from under his nails.”
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #266 from Mishkat al-Masabih, in the Book of Purification.