Sahih Bukhari Volume 008, Book 073, Hadith Number 150.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 73. Good Manners and Form (Al-Adab)
Narated By Anas bin Malik : The Prophet used to mix with us to the extent that he would say to a younger brother of mine, 'O father of 'Umar! What did the Nughair (a kind of bird) do?"