Yahya related to me from Malik from Yazid ibn Khusayfa that Urwaibn az-Zubayr said that he heard A'isha, the wife of the Prophet, mayAllah bless him and grant him peace, say, "The Messenger of Allah, mayAllah bless him and grant him peace, said, 'When a mumin is afflictedby something, even a thorn, it removes (or effaces) his wrongactions.' " Yazid did not know which of them Urwa said.
USC-MSA web (English) reference: Book 50, Hadith 6
Arabic reference: Book 50, Hadith 1719