Prayer (Kitab Al-Salat): Details of Commencing Prayer
Dawud :: Book 3 : Hadith 775
Narrated Aisha, Ummul Mu'minin:
When the Apostle of Allah (peace_be_upon_him) began his prayer, he said: "Glory be to Thee, O Allah," and "Praise be to Thee" and "Blessed is Thy name, and Exalted is Thy greatness, sand there is no god but Allah."