Mishkat al-Masabih #268
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عُثْمَانَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَا مِنَ امْرِئٍ مُسْلِمٍ تَحْضُرُهُ صَلَاةٌ مَكْتُوبَةٌ فَيُحْسِنُ وُضُوءَهَا وَخُشُوعَهَا وَرُكُوعَهَا إِلَّا كَانَتْ كَفَّارَةً لِمَا قَبْلَهَا مِنَ الذُّنُوبِ مَا لَمْ يُؤْتِ كَبِيرَةً وَذَلِكَ الدَّهْرَ كُلَّهُ» . رَوَاهُ مُسلم
‘Uthman reported God’s messenger as saying, “When the time for a prescribed prayer comes, if any Muslim observes proper ablution, humility and bowing, it will be an expiation for his past sins, so long as he has not committed a major sin; and that means for all time.”
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #268 from Mishkat al-Masabih, in the Book of Purification.