Sahih Muslim 196
Sahih Muslim · Book 1: The Book of Faith · Regarding the saying of the Prophet (saws): "I will be the first of the people to intercede concerning Paradise, and I will be the Prophet with the Greatest Number of Followers."
Anas b. Malik said:
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا حُسَيْنُ بْنُ عَلِيٍّ ، عَنْ زَائِدَةَ ، عَنِ الْمُخْتَارِ بْنِ فُلْفُلٍ ، قَالَ قَالَ أَنَسُ بْنُ مَالِكٍ قَالَ النَّبِيُّ صلى الله عليه وسلم " أَنَا أَوَّلُ شَفِيعٍ فِي الْجَنَّةِ لَمْ يُصَدَّقْ نَبِيٌّ مِنَ الأَنْبِيَاءِ مَا صُدِّقْتُ وَإِنَّ مِنَ الأَنْبِيَاءِ نَبِيًّا مَا يُصَدِّقُهُ مِنْ أُمَّتِهِ إِلاَّ رَجُلٌ وَاحِدٌ " .
The Apostle of Allah (ﷺ) 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 woald be an apostle among the apostles who would be testified to by only one man from his people.