Sahih Bukhari Volume 5, Book 58, Hadith Number 154.

Narated By Anas bin Malik : The Prophet said to Ubai, “Allah has ordered me to recite to you: ‘Those who disbelieve (Surat-al-Bayina 98).’ ” Ubai said, “Has He mentioned my name?” The Prophet said, “Yes.” On hearing this, Ubai started weeping.