Fasting

Bukhari :: Book 3 :: Volume 31 :: Hadith 148

Narrated '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.

Source materials are from the University of Southern California MSA site
Hadith eBooks converted from Imaan Star