Sahih Bukhari
247
Narrated Al-Bara 'bin `Azib: The Prophet said to me, Whenever you go to bed perform ablution like that for the prayer, lie or your right side and say, Allahumma aslamtu wajhi ilaika, wa fauwadtu `Amri ilaika, wa alja'tu Zahri ilaika raghbatan..
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