Abu Huraira reported Allah's Messenger ( صلی اللہ علیہ وسلم ) saying:
The Imam is appointed to be followed. So recite takbir when he recites it, and bow down when he bows down and when he utters: Allah listens to him who praises Him, say O Allah, our Lord, for Thee be the praise. And when he prays, standing, you should pray standing. And when he prays sitting, all of you should pray sitting.