The Book of the Sunnah
0/11.1. Chapter:
The Virtue of Abu Bakr Siddiq (ra)
Sunan Ibn Majah
حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا سُفْيَانُ، عَنِ الْحَسَنِ بْنِ عُمَارَةَ، عَنْ فِرَاسٍ، عَنِ الشَّعْبِيِّ، عَنِ الْحَارِثِ، عَنْ عَلِيٍّ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " أَبُو بَكْرٍ وَعُمَرُ سَيِّدَا كُهُولِ أَهْلِ الْجَنَّةِ مِنَ الأَوَّلِينَ وَالآخِرِينَ إِلاَّ النَّبِيِّينَ وَالْمُرْسَلِينَ لاَ تُخْبِرْهُمَا يَا عَلِيُّ مَا دَامَا حَيَّيْنِ " .
It was narrated that 'Ali said: "The Messenger of Allah said: 'Abu Bakr and 'Umar are the leaders of the mature people of Paradise, and the first and the last, except for the Prophets and Messengers, but do not tell them about that, O 'Ali, as long as they are still alive.'"
Reference : Sunan Ibn Majah 95In-book reference : Introduction, Hadith 0English translation : Vol. 1, Book 1, Hadith 95