Musnad Ahmad 932:9

Abu Ahmad al-Zubayri narrated to us, Sharik narrated to us, from Abdullah ibn Muhammad ibn Aqil, from al-Tufayl ibn Ubayy ibn Ka'b, from his father, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "When the Day of Resurrection comes, I will be the leader of the people, their orator, and the possessor of their intercession, and there is no boast."