Sahih Al Bukhari Hadith Number 789

And narrated Abu Huraira: Whenever Allah’s Messenger (peace be upon him) stood for the prayer, he said Takbir on starting the prayer and then on bowing. On rising from bowing he said, “Sami`a llahu liman hamidah,” and then while standing straight he used to say, “Rabbana laka-l hamd” (Al- Laith said, “(The Prophet (peace be upon him) said), ‘Wa laka l-hamd’.” He used to say Takbir on prostrating and on raising his head from prostration; again he would Say Takbir on prostrating and raising his head. He would then do the same in the whole of the prayer till it was completed. On rising from the second rak`a (after sitting for at-Tahiyyat), he used to say Takbir.

10  Call to Prayers (Adhaan)
Hadith number 789
Volume no 1
Chapter: 117 (Saying the Takbir on raising from the prostration)