Yahya related to me from Malik from Yahya ibn Said from AbuSalama ibn Abd ar-Rahman that he heard A'isha, the wife of theProphet, may Allah bless him and grant him peace, say, "I used to haveto make up days from Ramadan and not be able to do them until Shabancame."
USC-MSA web (English) reference: Book 18, Hadith 54
Arabic reference: Book 18, Hadith 688