Yahya related to me from Malik from Abd Rabbih ibn Said from AbuBakr ibn Abd ar-Rahman ibn al-Harith ibn Hisham from A'isha and UmmSalama, the wives of the Prophet, may Allah bless him and grant himpeace, that the Prophet, may Allah bless him and grant him peace, usedto get up in the morning junub from intercourse, not a dream, inRamadan, and then he would fast."
USC-MSA web (English) reference: Book 18, Hadith 10
Arabic reference: Book 18, Hadith 643