Supplication when throwing each pebble at the Jamaraat:
Every time The Prophet (sal-Allaahu ‘alayhe wa sallam) threw a pebble at any of the three jamaraat, he would say:
اللهُ أكْبَر
‘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.’