Sahih Bukhari Volume 006, Book 060, Hadith Number 485.
Narrated By Anas bin Malik : Allah's Prophet said to Ubai bin Ka'b, "Allah has ordered me to recite Quran to you." Ubai said, "Did Allah mention me by name to you?" The Prophet said, "Yes." Ubai said, "Have I been mentioned by the Lord of the Worlds?" The Prophet said, "Yes." Then Ubai burst into tears.