“The Messenger of Allah (ﷺ)
said: ‘The Imam is appointed to be followed. When he says Allahu
Akbar, then say Allahu Akbar; when he bows, then bow; when he says
Sami’ Allahu liman hamidah, then say Rabbana wa lakal-hamd; when he
prostrates then prostrate; if he prays standing, then pray standing,
and if he prays sitting down then pray sitting down.”
Sunan Ibn Majah Book 5, Hadith 437