They used to say prayer behind the Messenger of Allah (ﷺ). I never saw anyone bending his back at the time when he (the Holy Prophet) raised his head, till the Messenger of Allah (ﷺ) placed his forehead on the ground. They then fell in prostration after him.
Sahih Muslim Book 4, Hadith 224
← Previous Hadith I have never said such a light and perfect prayer as I said behind the Messenger of Allah (ﷺ). The prayer of the Messenger. of Allah (ﷺ) was well balanced. And so too was the prayer of Abu Bakr well balanced. When it was the time of 'Umar b. al-Khattab he prolonged the morning prayer. When the Messenger of Allah (ﷺ) said: Allah listened to him who praised Him, he stood erect till we said: He has forgotten. He then prostrated and sat between two prostration till we said: He has forgotten.

Sahih Muslim Book 4, Hadith 223 Next Hadith → When the Messenger of Allah (ﷺ) said: Allah listened to him who praised Him, none of us bent his back till he (the Holy Prophet) prostrated; we then, afterwards, went down in prostration.

Sahih Muslim Book 4, Hadith 225