Silsilat al-Ahadith al-Sahihah

Sulaiman bin Amr bin Ahwas narrates from his mother, Sayyidah Umm Jundab (may Allah be pleased with her), she says: I saw the Messenger of Allah (peace and blessings be upon him) that he stoned the Jamrah from within the valley, while he was riding, and with every pebble he said "Allahu Akbar." A man was sitting behind him who was shading him. I inquired about this man, who was he? They said: He was Fadl bin Abbas. A large number of people had gathered. The Noble Prophet (peace and blessings be upon him) said: "No one should kill anyone, nor should anyone wound anyone, and when you stone the Jamrah, the pebbles should be of the size that can be thrown between the middle two fingers (i.e., about the size of a chickpea or a lentil seed)."