Musnad Ahmad 27:1885

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from al-Zuhri, from Salim, from Ibn 'Umar, who said: "The Messenger of Allah, peace and blessings of Allah be upon him, used to raise his hands when he said the takbir until they were level with his shoulders, or close to that. And when he bowed, he would raise them, and when he raised his head from the bowing, he would raise them, but he would not do that during the prostration."