Yahya related to me from Malik from Abdullah ibn Dinar fromAbdullah ibn Umar that the Messenger of Allah, may Allah bless him andgrant him peace, said, "Bilal calls the adhan whilst it is still nightso eat and drink until Ibn Umm Maktum calls the adhan."
App reference: Book 3, Hadith 15
USC-MSA web (English) reference: Book 3, Hadith 15
Arabic reference: Book 3, Hadith 161