Musnad Abu Ya'la al-Mawsili 131:13

Abu Khaythama narrated to us, Jarir narrated to us, from al-Mukhtar ibn Fulful, from Anas ibn Malik, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "I am the first of those who will intercede in Paradise, and I am the one among the prophets who will have the most followers."