Establishing the Prayer and the Sunnah Regarding Them

It was narrated from Abu Sa’eed Al-Khudri that he heard the Messenger of Allah (ﷺ) say:

“When the Imam says: ‘Sami’ Allahu liman hamidah (Allah hears those who praise Him),’ say: ‘Allahumma, Rabbana wa lakal-hamd (O Allah! O our Lord! To You is the praise).’”