Salim bin Abdullah bin Umar (may Allah have mercy on him) narrates from his father (Sayyiduna Abdullah bin Umar, may Allah be pleased with them both) that he said: I saw the Messenger of Allah (peace and blessings be upon him): when he began the prayer, he would raise his hands up to the level of his shoulders; and when he bowed, and when he raised his head from bowing, he would again raise his hands up to the level of his shoulders; but he did not do so in the prostrations.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2301