Sahih Al Bukhari – Book of Interpretation Of Dreams
Volumn 009, Book 087, Hadith Number 115.
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Narated By Abu Qatada : The Prophet said, "A good dream that comes true is from Allah, and a bad dream is from Satan, so if anyone of you sees a bad dream, he should seek refuge with Allah from Satan and should spit on the left, for the bad dream will not harm him."
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