Musannaf Ibn Abi Shayba 27:13

Hussain bin Ali narrated to us, from Za'idah, from al-Mukhtar, from Anas, who said: The Prophet (peace and blessings of Allah be upon him) said: "I am the first intercessor in Paradise." And he said: "No prophet was believed as I have been believed. And indeed, among the prophets is a prophet whom none of his nation believed except for one man."