عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ أَوْ قَالَ: قَالَ أَبُو الْقَاسِمِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((أَمَا يَخَافُ الَّذِي يَرْفَعُ رَأْسَهُ وَالْإِمَامُ سَاجِدٌ أَنْ يُحَوِّلَ اللَّهُ رَأْسَهُ رَأْسَ حِمَارٍ))
Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that Abul Qasim, the Messenger of Allah (peace and blessings be upon him), said: Does the person who raises his head while the Imam is in the state of prostration not fear that Allah Almighty may transform his head into the head of a donkey?