(30) باب تَأْوِيلِ قَوْلِهِ عَزَّ وَجَلَّ { وَإِذَا قُرِئَ الْقُرْآنُ فَاسْتَمِعُوا لَهُ وَأَنْصِتُوا لَعَلَّكُمْ تُرْحَمُونَ }
It was narrated that Abu Hurairah said:
"The Messenger of Allah (ﷺ) said: 'The Imam is appointed to be followed, so when he says the takbir, say the takbir, and when he recites, be silent, and when he says: "Sami' Allahu liman hamidah (Allah hears those who praise Him)," say: "Allahumma rabbana lakal-hamd (Our Lord, to You be praise)."
Reference: Sunan an-Nasa'i 921
In-book reference: Book 11, Hadith 46
English translation: Vol. 2, Book 11, Hadith 922