The Messenger of Allah ﷺ said, "Bilal calls the adhan at night, so eat and drink until Ibn Umm Maktum makes the call."
أخبرنا قتيبة عن مالك عن عبد الله بن دينار
أن رسول الله ﷺ قال إن بلالا يؤذن بليل فكلوا واشربوا حتى ينادي ابن أم مكتوم
Bukhari, in the Book of Adhan, chapter on the adhan after Fajr, hadith no. 620, from the hadith of Malik, narrated it this way. It is also found in the Muwatta (narration of Yahya): 1/74, and in Kubra, hadith no. 1601.