Yahya related to me from Malik from Hisham ibn Urwa from hisfather from Humran, the mawla of Uthman ibn Affan, that Uthman ibnAffan was once sitting on the Maqaid (the benches surrounding theMadina Mosque, or else a stone near Uthman ibn Affan's house where hesat to discuss with people), when the muadhdhin came and told him thatit was time for the asr prayer. He called for water and did wudu. Thenhe said, "By Allah, I shall tell you something which I would not tellyou if it were not in the Book of Allah. I heard the Messenger ofAllah, may Allah bless him and grant him peace, say, 'If a man doeswudu, and makes sure he does it correctly, and then does the prayer,he will be forgiven everything that he does between then and the timewhen he prays the next prayer.' "Yahya said that Malik said,"I believe he meant this ayat - 'Establish prayer at the two ends ofthe day and in some watches of the night. Good actions take away wrongactions. That is a reminder for those who remember.' " (Sura 11 ayat114).
USC-MSA web (English) reference: Book 2, Hadith 30
Arabic reference: Book 2, Hadith 60