Sayyidah Umm Jundub (may Allah be pleased with her) narrates: I saw the Messenger of Allah (peace and blessings be upon him) stoning Jamrat al-Aqabah on the Day of Sacrifice from the bottom of the valley, and he was saying: "O people, do not kill one another, and stone with pebbles the size of small flicking-pebbles." He (peace and blessings be upon him) threw seven pebbles, then departed and did not stop, and behind him (peace and blessings be upon him) was a man shielding him (peace and blessings be upon him) from the people. I asked: "Who is this?" The people said: "This is al-Fadl bin Abbas (may Allah be pleased with them both)."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21851