Sahih Muslim
The Book of Fasting (Kitab Al-Sawm)
Book Number: 006 / Hadith Number: 2400
Abdullah b. 'Umar (Allah be pleased with both of them) reported: I heard the Messenger of Allah (may peace be upon him) as saying: Bilal announces Adhan during the night, so you eat and drink, till you hear the Adhan of Ibn Umm Maktum.