The Book of Menstruation (Kitab Al-Haid)
Muslim :: Book 3 : Hadith 601
Ibn 'Umar said: 'Umar asked the verdict of the Shari'ah from the Apostle (may peace be upon him) thus: Is it permissible for any one of us to sleep in a state of impurity? He (the Holy Prophet said: Yes, he must perform ablution and then sleep and take a bath when he desires.
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