Sahih Al Bukhari – Book of Characteristics Of Prayer
Volumn 001, Book 012, Hadith Number 775.
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Narated By Al-Bara’ bin ‘Azib : (We used to pray behind the Prophet and when he said, “Sami’ a-l-lahu Liman hamida”, none of us would bend his back (to go for prostration) till the Prophet had placed his, forehead on the ground.
Picture: Ahmed Shah Mosque: Afghanistan