Sahih Al Bukhari - Book of Characteristics Of Prayer
Volumn 001, Book 012, Hadith Number 704.
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Narated By Abu Qilaba : I saw Malik bin Huwairith saying Takbir and raising both his hands (on starting the prayers and raising his hands on bowing and also on raising his head after bowing. Malik bin Huwairith said, "Allah's Apostle did the same."
