Sahih Muslim Book 1, Hadith Number 383.

Chapter : Pertaining to the words of the Apostle of Allah (may peace be upon him): “I would be the first among people to Intercede in the Paradise and among the Apostles I would have the largest following”.

Anas b. Malik said: The Apostle of Allah (may peace be upon him) said: I would be the first intercessor in the Paradise and no apostle amongst the apostles has been testified (by such a large number of people) as I have been testified. And verily there would be an apostle among the apostles who would be testified to by only one man from his people.