Sahih Muslim Book 4, Hadith Number 769.

Chapter : The desirability of raising the hands apposite the shoulders at the time of beginning the prayer and at the time of bowing and at the time of returning to the erect position after bowing.

Suhail reported on the authority of his father that Abu Huraira used to recite takbir on all occasions of rising and bending (in prayer) and narrated that the Messenger of Allah (may peace be upon him) used to do like that.