Hadith: Following your Imam Strictly

Narrated Abu Huraira (Radi-Allahu 'anhu):

The Prophet (Sallallahu 'Alaihi Wa Sallam) said, "Isn't he who raises his
head before the Imam afraid that Allah may transform his head into that of
a donkey or his figure (face) into that of a donkey?"

Bukhari Vol. 1 : No. 660

Comment: always be careful in following the imam. Islam promotes the concept of discipline.