Sunan at-Tirmidhi (Jami-al-Tirmidhi), Chapter: Salah (Prayers)

that Allah's Messenger said, "Salah is in twos, the tashahhud after every two rakaat. It is to be humble and pleading, fearful and beseeching and to raise both hands." The narrator explained that the insides of the hands should be towards the face and raised, and one should plead, "0 my Lord, 0 my Lord!" One who does not do that is like this and like that."