7-Straightening up from Rukoo':

The prophet (sallallaahu 'alaihi wa sallam) would straighten up his back out of rukoo', saying :

Sami' Allah hu liman hamidah
This means: Allaah listens to the one who praises Him

Then .. while he is still standing he would say :

Rab-bana wa lakal hamd
This means: Our Lord, to You be all Praise

Note :

When you Straightening up from Rukoo': you would raise your hands like what we discribed early in the Takbeer.

http://www.islamway.com/english/images/prayer/pray7.htm