Hadithcore
Sahih al-Bukhari, 691
sahih

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 ‏

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References2 variants
In-Book Reference
Book 10, Hadith 86
USC-MSA web (English) reference
Vol. 1, Book 11, Hadith 660 (deprecated numbering scheme)
Sharh · explanationclick to expand
There are rules and regulations for offering the prayer in congregation, that the Muslim should pay attention to and learn. One of the most important of these rules is that the worshipper should follow the imam in all his movements, for the imam has been appointed to be followed. In this hadith, the Prophet (blessings and peace of Allah be upon him) warns those who pray behind a imam against failing to follow their imam and raising their heads before the imam raises his head after bowing. He warns the one who does that that Allah may turn his head into the head of a donkey, as he said: “Doesn’t one of you fear, if he raises his head before the imam, that Allah will turn his head into the head of a donkey? Or He will turn his form into that of a donkey.” This is a question by way of rebuke and denunciation. It may be that the meaning is metaphorical, because the donkey is renowned for stupidity, and it is as if the Messenger of Allah (blessings and peace of Allah be upon him) was describing the one who does that as being stupid and lacking in understanding, or warning him that he could be deprived of the blessing of understanding, so he will be like a donkey. Or it may be that the meaning is as it appears to be, so Allah would turn his head into the head of a donkey in a real sense. This is a stern warning and deterrent against failing to follow the imam and doing the actions of prayer before him. This prayer indicates that it is prohibited to do the actions of prayer before the imam. It also contains a stern warning to the one who raises his head before the imam does..
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