حَدَّثَنَا أَبُو نُعَيْمٍ، عَنْ سُفْيَانَ، عَنْ أَبِي إِسْحَاقَ، نَحْوَهُ بِهَذَا.
Narrated Al-Bara:(and he was not a liar) When Allah's Messenger (ﷺ) said, "Sami`a l-lahu liman hamidah" none of us bent his back (for prostration) till the Prophet (ﷺ) prostrated and then we would prostrate after him
Sahih al-Bukhari 690
Chapter 10