Mishkat al-Masabih
Mishkat al-Masabih 1141
The manner in which one who is led in prayer by an Imam must follow him, and the rule applying to the one who is preceded by him - Section 1
Arabic hadith text
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَمَا يَخْشَى الَّذِي يَرْفَعُ رَأْسَهُ قَبْلَ الْإِمَامِ أَنْ يُحَوِّلَ اللَّهُ رَأْسَهُ رَأْسَ حمَار»
Translation
Abu Huraira reported God’s Messenger as saying, “Does he who raises his head before the imam not fear that God may change his head into a donkey’s?” (Bukhari and Muslim.)