Musnad Ahmad 658:130

'Affan narrated to us, he said: Abu 'Awanah narrated to us, from Hilal ibn Abi Humayd, from 'Abd al-Rahman ibn Abi Layla, from al-Bara' ibn 'Azib, who said: "I observed the prayer with Muhammad, peace and blessings of Allah be upon him, and I found his standing, his bowing, his rising after the bowing, his prostration, his sitting between the two prostrations, and his sitting between the salutation and the departure to be nearly equal."