It was narrated that Abu Hurairah said: “The Messenger of Allah صلی اللہ علیہ وآلہ وسلم 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: Rabbanalakal hamd (Our Lord, to You be praise).” (Sahih)