Jami` at-Tirmidhi 582
جامع الترمذي#582SahihAbu Hurairah narrated:"Muhammad said: 'Does not the one who raises his head before the Imam fear that Allah will transform his head into a donkey's head?
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 6:39