Mishkat al-Masabih #268
Purification
‘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. Mishkat al-Masabih contains 4,428 hadiths across 25 books.