Bismillah Walhamdulillah Was Salaatu Was Salaam ‘ala Rasulillah
Narrated Abu Said (Radi-Allahu ‘anhu):
I heard the Prophet (Sallallahu ‘Alaihi Wa Sallam) saying, “Allah will bring forth the severest Hour, and then all the Believers, men and women, will prostrate themselves before Him, but there will remain those who used to prostrate in the world for showing off and for gaining good reputation. Such people will try to prostrate (on the Day of Judgment) but their backs will be as stiff as if it is one bone (a single vertebra).”
Bukhari Vol. 6 : No. 441