Fiqh-us-Sunnah Volume 002, Supererogatory Prayer, Fiqh 2.052A.

Section : It is obligatory to follow the imam and forbidden to precede him.

Abu Hurairah reports that the Prophet sallallahu alehi wasallam said: "The imam is selected to be followed; therefore, do not differ with him. When he makes the takbir, make the takbir, when he goes into ruku', make ruku'. When he says 'Allah hears him who praises Him,' say 'O Allah, our Lord, to You belongs the Praise.' When he goes into sajdah, make sajdah. If he prays sitting, then all should be sitting." This is related by the group. In the version by Ahmad and Abu Dawud, the wording is "the imam is to be followed. If he makes the takbir, make the takbir, and do not make the takbir until he does so. When he goes into ruku', make ruku', and do not perform ruku' until he does so. When he goes into sajdah, make sajdah, and do not make sajdah until he does so."

Abu Hurairah reports that the Prophet sallallahu alehi wasallam said: "Do you not fear that if you raise your head before the imam Allah may change your head into that of a donkey!" This is related by the group.

Anas reports that the Messenger of Allah sallallahu alehi wasallam said: "O people, I am your imam, so do not precede me in ruku' or in sujjud or in qiyam or in sitting or in finishing." This is related by Ahmad and Muslim.

Al-Bara' ibn 'Azib says: "We prayed with the Messenger of Allah and when he said 'Allah hears him who praises Him,' none of us would bend his back until the Messenger of Allah had put his forehead upon the ground." This is related by the group.

Related Hadith(s)