Sahih Muslim Book 4, Hadith Number 953.

Chapter : The duty of the Imam is to be brief and perfect in prayer.

Al-Bara’ b. ‘Azib reported: I noticed the prayer of Muhammad (may peace be upon him) and saw his Qiyam (standing), his bowing, and then going back to the standing posture after bowing, his prostration, his sitting between the two prostrations, and his prostration and sitting between salutation and going away, all these were nearly equal to one another.