Sahih Muslim Book 1, Hadith Number 387.

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”.

‘Amr b. Abu Sufyan transmitted a hadith like this from Abu Huraira who narrated it from the Messenger of Allah (may peace be upon him).