Sahih Bukhari Volume 006, Book 061, Hadith Number 511.
Narrated By Zaid bin Thabit : Abu Bakr sent for me and said, "You used to write the Divine Revelations for Allah's Apostle : So you should search for (the Qur'an and collect) it." I started searching for the Qur'an till I found the last two Verses of Surat At-Tauba with Abi Khuzaima Al-Ansari and I could not find these Verses with anybody other than him. (They were):
'Verily there has come unto you an Apostle (Muhammad) from amongst yourselves. It grieves him that you should receive any injury or difficulty...' (9.128-129)