When throwing each of the seven pebbles at the Jamarat, the jamaah haji says 'Allahu Akbar' (Allah is the Greatest) with each throw. After stoning the first and second Jamrah (on the days of Tashreeq), the jamaah haji stands facing the Qiblah and makes extended doa. No doa is made after stoning Jamrat al-Aqabah (the largest).
اللَّهُ أَكْبَرُ، اللَّهُ أَكْبَرُ، اللَّهُ أَكْبَرُ. اللَّهُمَّ اجْعَلْهُ حَجًّا مَبْرُورًا وَذَنْبًا مَغْفُورًا وَسَعْيًا مَشْكُورًا. اللَّهُمَّ اجْعَلْهُ رَجْمًا لِلشَّيْطَانِ وَرِضًا لِلرَّحْمَنِ
Allahu Akbar, Allahu Akbar, Allahu Akbar. Allahumma-j'alhu hajjan mabruran wa dhanban maghfuran wa sa'yan mashkuran. Allahumma-j'alhu rajman lish-shaytani wa ridan lir-Rahman.
Meaning: Allah is the Greatest, Allah is the Greatest, Allah is the Greatest. O Allah, make it an accepted Haji, a forgiven sin, and an effort that is appreciated. O Allah, make it a stoning of the devil and a source of pleasure for the Most Merciful.
Source: Sahih Muslim #1299Ibn Umar (may Allah be pleased with him) reported that Nabi (shallallahu alaihi wa sallam) used to stand for a long time making doa after stoning the first and second Jamrah, raising his hands. He did not stop after stoning Jamrat al-Aqabah. (Sahih al-Bukhari 1751, 1752, 1753)
اللَّهُ أَكْبَرُ، اللَّهُ أَكْبَرُ، اللَّهُ أَكْبَرُ. اللَّهُمَّ اجْعَلْهُ حَجًّا مَبْرُورًا وَذَنْبًا مَغْفُورًا وَسَعْيًا مَشْكُورًا. اللَّهُمَّ اجْعَلْهُ رَجْمًا لِلشَّيْطَانِ وَرِضًا لِلرَّحْمَنِ
The Prophet (peace be upon him) threw seven pebbles at Jamrat al-Aqabah on the Day of Sacrifice, saying 'Allahu Akbar' with each pebble — pebbles about the size of date stones — and he threw from the bottom of the valley.