(12) باب الأَذَانِ بَعْدَ الْفَجْرِ
Narrated `Abdullah bin `Umar:
Allah's Messenger (ﷺ) said, "Bilal pronounces the Adhan at night, so keep on eating and drinking (Suhur) till Ibn Um Maktum pronounces the Adhan."
Reference: Sahih al-Bukhari 620
In-book reference: Book 10, Hadith 18
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 594