Bukhari :: Book 3 :: Volume 31 :: Hadith 153
Narrated Abu Bakr bin 'Abdur-Rahman:
My father and I went to 'Aisha and she said, "I testify that Allah's Apostle at times used to get up in the morning in a state of Janaba from sexual intercourse, not from a wet dream and then he would fast that day." Then he went to Um Salama and she also narrated a similar thing.
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