Sahih Bukhari
Sahih Bukhari Volume 003, Book 031, Hadith Number 148.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 31. Fasting
Narated By 'Aisha and Um Salama : At times Allah's Apostle used to get up in the morning in the state of Janaba after having sexual relations with his wives. He would then take a bath and fast.