Abu Hurairah (RA) reported: The Messenger of Allah ( صلی اللہ علیہ وسلم ) said: The Imam is appointed, so that he should be followed, so don't be at variance with him. Recite takbir when he recites it; bow down when he bows down and when he says: "Allah listens to him who praises Him," say: "O Allah, our Lord, to Thee be the Praise." And when he (the Imam) prostrates, you should also prostrate, and when he says prayer sitting, you should all observe prayer sitting.

A hadith like this has been transmitted by Hammam bin Munabbih from the Apostle of Allah ( صلی اللہ علیہ وسلم ) on the authority of Abu Hurairah (RA) .