When throwing each pebble at the Jamarat

When throwing each pebble at the Jamarat
i.e. Stoning the three areas at Mina during Hajj.
(224)
Every time the Prophet  threw a pebble at any of the three jamarat, he would say:
اللهُ أَكْبَرُ.
Allahu akbar.
Allah is the greatest
on completion of the first jamarah, he advanced a little, stood facing the qiblah, raised his hands and supplicated. He also did this after the second jamarah but not the third.