(24) باب الإِشَارَةِ فِي الطَّلاَقِ وَالأُمُورِ
Narrated 'Abdullah bin Mas'ud:
The Prophet (ﷺ) said, "The call (or the Adhan) of Bila should not stop youfrom taking the Suhur-meals for Bilal calls (or pronounces the Adhan) so that the one who is offering the night prayer should take a rest, and he does not indicate the daybreak or dawn." The narrator, Yazid, described (how dawn breaks) by stretching out his hands and then separating them wide apart.
Reference: Sahih al-Bukhari 5298
In-book reference: Book 68, Hadith 47
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 63, Hadith 219