Narrated Abu Huraira:
The Prophet ﷺ 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?"
حَدَّثَنَا حَجَّاجُ بْنُ مِنْهَالٍ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ مُحَمَّدِ بْنِ زِيَادٍ، سَمِعْتُ أَبَا هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ
" أَمَا يَخْشَى أَحَدُكُمْ ـ أَوْ لاَ يَخْشَى أَحَدُكُمْ ـ إِذَا رَفَعَ رَأْسَهُ قَبْلَ الإِمَامِ أَنْ يَجْعَلَ اللَّهُ رَأْسَهُ رَأْسَ حِمَارٍ أَوْ يَجْعَلَ اللَّهُ صُورَتَهُ صُورَةَ حِمَارٍ ".
• Sahih al-Bukhari, 691
• Sahih al-Bukhari, Vol. 1, Book of Call to Prayer, Hadith 660
• Sahih al-Bukhari, Book of Call to Prayer, Hadith 660