Hadith Number 811

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Narrated Al-Bara' bin `Azib

(He was not a liar) We used to pray behind the Prophet (ﷺ) and when he said, "Sami`a l-lahu liman hamidah", none of us would bend his back (to go for prostration) till the Prophet (ﷺ) had placed his, forehead on the ground.