Narrated by:Abu Hurairah said
It was narrated that Abu Hurairah said:“The Messenger of Allah (ﷺ) said: ‘Does not the one who raises his head before the Imam fear that Allah may turn his head into the head of a donkey?’”
حَدَّثَنَا حُمَيْدُ بْنُ مَسْعَدَةَ، وَسُوَيْدُ بْنُ سَعِيدٍ، قَالاَ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، حَدَّثَنَا مُحَمَّدُ بْنُ زِيَادٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " أَلاَ يَخْشَى الَّذِي يَرْفَعُ رَأْسَهُ قَبْلَ الإِمَامِ أَنْ يُحَوِّلَ اللَّهُ رَأْسَهُ رَأْسَ حِمَارٍ؟ " .
IbnMaja
Establishing the Prayer and the Sunnah Regarding Them • Hadith 961