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 · Hadith 690
Call to Prayers (Adhaan)Narrated Abu 'Is-haq: As above
