Sunan Abi Dawud Book 2, Hadith 232
then they would follow him (ﷺ)
Al-Bara b.‘Azib said ; we used to pray along with the prophet (ﷺ); none of us bowed his back until he saw that the prophet (ﷺ) bowed (his back).
Abu Hurairah reported the Messenger of Allah (ﷺ) as saying; Does he who raises his head while the Imam is prostrating not fear that Allah may change his head into a donkey’s or his face into a donkey’s face.