Sahih Al Bukhari – Book of Bathing (Ghusl)
Volumn 001, Book 005, Hadith Number 284.
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Narated By Abu Salama RA : I asked ‘Aisha RA “Did the Prophet PBUH use to sleep while he was Junub?” She RA replied, “Yes, but he used to perform ablution (before going to bed).
Junaid Tahir