The Messenger of Allah ﷺ said: Does the man who lifts his head before the Imam not fear that Allah may change his face into that of an ass?
قَالَ رَسُولُ اللَّهِ ﷺ مَا يَأْمَنُ الَّذِي يَرْفَعُ رَأْسَهُ فِي صَلاَتِهِ قَبْلَ الإِمَامِ أَنْ يُحَوِّلَ اللَّهُ صُورَتَهُ فِي صُورَةِ حِمَارٍ