"Muhammad (ﷺ) said: 'Does the one who raises his head before the Imam not fear that Allah may turn his head into the head of a donkey?"'
Sunan an-Nasa'i Book 10, Hadith 52
← Previous Hadith "I saw the Messenger of Allah (ﷺ)leading the people in prayer, carrying Umamah bint Abi Al-As on his shoulder. When he bowed he put her down and when he stood up from prostration he picked her up again."

Sunan an-Nasa'i Book 10, Hadith 51 Next Hadith → "I heard 'Abdullah bin Yazid delivering a Khutbah. He said: 'Al-Bara, who was no liar,told us that when they prayed with the Messenger of Allah (ﷺ) would raise his head from bowing and they would remain standing until they saw him prostrate, then they would prostrate."'

Sunan an-Nasa'i Book 10, Hadith 53