Abu Dawud Book 35, Hadith Number 4635.
Chapter : Not known.
Narated By AbuHurayrah : The Prophet (PBUH) said: Gabriel came and taking me by the hand showed the gate of Paradise by which my people will enter. AbuBakr then said: Apostle of Allah! I wish I had been with you so that I might have looked at it. The Apostle of Allah (PBUH) then said: You, AbuBakr, will be the first of my people to enter Paradise.