Sunan Abu Dawood, Chapter: Prayer (Kitab Al-Salat): Details of Commencing Prayer

When the Apostle of Allah (peace_be_upon_him) uttered the takbir (Allah is most great) for prayer (in the beginning), he raised his hands opposite to his shoulders; and when he bowed, he did like that; and when he raised his head to prostrate, he did like that; and when he got up at the end of two rak'ahs, he did like that.