Yahya related to me from Malik from Sumayy, the mawla of AbuBakr, from Abu Bakr ibn Abd ar-Rahman that A'isha and Umm Salama, thewives of the Prophet, may Allah bless him and grant him peace, said,"The Messengerof Allah, may Allah bless him and grant him peace, usedto get up in the morning junub from intercourse, not a dream, andwould then fast."
USC-MSA web (English) reference: Book 18, Hadith 12
Arabic reference: Book 18, Hadith 645