690
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 BukhariHadith 690 (2 narrations)
690.2
Narrated Abu 'Is-haq:As above