Sahih Bukhari
Sahih Bukhari Volume 009, Book 091, Hadith Number 354.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 91. Accepting Information given by a Truthful Person
Narrated By 'Abdullah bin 'Umar : The Prophet said, "Bilal pronounces the Adhan at night so that you may eat and drink till Ibn Um Maktum pronounces the Adhan (for the Fajr prayer)."