Sahih al-Bukhari 750

It is related that Abu Hurayra said, "When the Messenger of Allah, may Allah bless him and grant him peace, got up for the prayer, he said the takbir when he stood up and the takbir when he did ruku'. Then he said, 'Allah hears whoever praises him,' when his back was straight after coming back from ruku'. Then as he was standing he said, 'Our Lord, praise is yours.' ('Abdullah said, 'And praise is yours.') Then he said the takbir when he went down and then the takbir when he raised his head. Then he said the takbir when he went into sajda and the takbir when he raised his head again. Then he did the same all through the prayer until he had finished it. He said the takbir when he stood up from the sitting position after the first two rak'ats." XXXVI: Placing the palms on the knees in ruku' Abu Humayd said to his companions, "The Prophet, may Allah bless him and grant him peace, put his hands on his knees."