Sahih Bukhari Volume 8, Book 80, Hadith Number 730.

Narrated By Ibn ‘Abbas : The person about whom Allah’s Apostle said, “If I were to take a Khalil from this nation (my followers), then I would have taken him (i.e., Abu Bakr), but the Islamic Brotherhood is better (or said: good),” regarded a grandfather as the father himself (in inheritance).